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Most recent 19 results returned for keyword: Main Sequence (Search this on MAP)

https://plus.google.com/101341080015882011646 UniverseSpace BioC : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
17 hours ago - Via Reshared Post - View -
https://plus.google.com/107601407697821455104 Stavros Basilias : How To Build A Star Suppose you wanted to build a star. Perhaps you’re part of an advanced Kardashev...
How To Build A Star

Suppose you wanted to build a star. Perhaps you’re part of an advanced Kardashev Type 3 civilization, and you need to make a star for your third grade science project. How would you go about creating a star?

On a basic level, it’s quite simple to build a star. Simply gather a star’s worth of gas and dust, let it collapse together under its own weight, and given enough time a star will form. This is how stars form naturally. But since we might be graded on this project, it would be nice to have an idea of how much mass we might need, and what the size and temperature of the resulting star might be.

The answer depends quite a bit upon what material you use, and how the material behaves under different temperatures and pressures (what’s sometimes called its equation of state). Since the most common material in the universe is hydrogen, lets keep things simple and assume we’ll build our star out of pure hydrogen. Since hydrogen has a very simple equation of state, it’s an easy matter to calculate what will happen as we build our star.

When we start to gather hydrogen together, two things will start to happen. The first is that the gravitational attraction between the hydrogen atoms will start to collapse the gas under its own weight. The second is that the pressure of the hydrogen will push back against the weight. Given time the gas will reach hydrostatic equilibrium, where the pressure of the gas is equal its weight, at which point you have a stable ball of hydrogen. This by itself isn’t enough to make a star. If you gathered a Saturn’s mass worth of hydrogen, what you would have is a Saturn-sized planet, not a star. The obvious solution is to simply add more hydrogen, which would make your planet bigger and bigger. Eventually your ball of gas would grow to a Jupiter-sized planet, and you just keep adding more hydrogen.

But it turns out that something interesting happens when you keep adding more hydrogen to your planet. The more hydrogen you have, the more mass you have, and that means more weight. The gas is squeezed more strongly, and as a result it compresses. So if you double the mass of your Saturn-sized planet, you don’t get a planet twice as big as Saturn. You get a planet that is a bit bigger than Saturn, but with a higher density. For example, Jupiter is more than three times the mass of Saturn, but only about 15% larger in size. However Jupiter has an average density about twice that of Saturn.

As you keep adding more mass, your planet will get bigger up to about 3 Jupiter masses. At that point, the weight of your ball of hydrogen is so large that adding more actually makes the planet smaller. As a result, a planet 10 times the mass of Jupiter would be about the same size as Jupiter itself. This poses a real challenge for astronomers that study exoplanets. Just because a planet is Jupiter sized doesn’t mean it has a Jupiter mass. The same is true for smaller planets. A “super-Earth” planet a bit larger than Earth could be a rocky planet or a small Neptune-like planet depending upon what it’s made of.

Once your ball of hydrogen reaches about 15 Jupiter masses it enters the regime of brown dwarfs. Adding more mass continues to make it smaller, but by this point the temperature of its interior starts to play a significant role. Our simple model of hydrostatic equilibrium isn’t enough. The hydrogen in the center is being squeezed so strongly that it heats up significantly. So while a brown dwarf is roughly the same size as Jupiter, it can be more than 10 times hotter. Adding more mass continues to shrink the brown dwarf slightly, but there comes a point where the interior becomes so hot that it raises the pressure of the hydrogen faster than the added weight can squeeze. Just as there is a maximum size for a planet, there is a minimum size for a brown dwarf. That minimum size is about 80% that of Jupiter, at which point a brown dwarf has a temperature of about 2000 K. Such a brown dwarf would look like a small, dim star.

But a true star is one in which nuclear fusion occurs in its core. A star’s light and heat isn’t due to gravitational contraction, but rather the creation of energy by fusing hydrogen into helium. This starts to occur when your ball of hydrogen reaches about 90 Jupiter masses, which coincidentally is about the same mass as a minimum-sized brown dwarf. Now that you’ve made a star, adding more hydrogen just makes it larger and hotter. Because stars fuse hydrogen in their core, their size and density changes over time. But if we only consider stable, main sequence stars, then there’s a simple relation between mass and size. So you can just decide how much hydrogen to use, and calculate the size of your star.

Of course this is just a simple hypothetical stars. Real stars aren’t made purely of hydrogen, and depending on their origin and age they can behave very differently than our simple star. The details will be left as a homework exercise for the reader.
How To Build A Star
Suppose you wanted to build a star. How would you go about making one?
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https://plus.google.com/116645362644672813580 Main Sequence Technology, Inc. : Want to export your perm placement and timesheet data from PCRecruiter to QuickBooks? You can! Check...
Want to export your perm placement and timesheet data from PCRecruiter to QuickBooks? You can! Check out this short video overview - http://hubs.ly/H0161PM0
PCRecruiter and QuickBooks - PCRecruiter
PCRecruiter is integrated with Intuit QuickBooks, making it possible to export information about your permanent placements and contractor hours timesheets from your recruiting database into your invoicing system. This brief overview video shows you how it works. If you’re a QuickBooks user (Windows desktop or online edition) and would like to get PCRecruiter connected, contact …
3 days ago - Via - View -
https://plus.google.com/110884459314843180066 mani Chenugunta : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/104282589772198168289 Francisco javier : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/104282589772198168289 Francisco javier : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/104282589772198168289 Francisco javier : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/104282589772198168289 Francisco javier : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/104282589772198168289 Francisco javier : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/104282589772198168289 Francisco javier : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/104282589772198168289 Francisco javier : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/104282589772198168289 Francisco javier : Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has ...

Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. 
Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter 
while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in 
about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5 degrees, 
transit was detected due to low semi-major axis to host star radius ratio.Kepler-91b is expected to be engulfed by the parent 
star within about 55 million years."Simulation of a dawn"
Watch the video: susnset~1.avi
https://lh3.googleusercontent.com/-MwJWOMxrh2o/VPn-A2vlXkI/AAAAAAAAHQA/WKSncL1gNKc/w506-h379-n-o/susnset%257E1.avi
Kepler-91b is a planet orbiting Kepler-91, a star slightly more massive than the Sun. Kepler-91 has left the main sequence and is now a red giant branch star Kepler-91b is about 14% less massive than Jupiter while being more than 35% larger, making it less than half of the density of water. Kepler-91b orbits around the host star in about 6.25 days. Despite being one of the least edge-on orbits relative to Earth with inclination being about 68.5
5 days ago - Via Reshared Post - View -
https://plus.google.com/116306856023304668270 Alice “Loli” Dark :

What occurs that causes a main sequence star to lose its equilibrium and move on to the next stage in its evolution
This happens when a main sequence star uses up all of its fuel and swells. Next stage: Red Giant.
5 days ago - Via Google+ - View -
https://plus.google.com/111753145864061697079 Zorean Dean : A Celestial Narrative: The Neutron Star Out of the amazing lives and spectacular deaths of stars ranging...
A Celestial Narrative: The Neutron Star

Out of the amazing lives and spectacular deaths of stars ranging from 1A Supernovae to gravitational dominance over mass resulting in the infamous Black Hole (otherwise known as a singularity); One in particular captures my awe and intrigue the most. The life of a star with the same relative mass of our Sun. A Yellow Main Sequence Star, or F-Type Main Sequence Star. From sloughing off the outer layers of gases weakly held to the surface by gravity (which occurs from the swelling caused by the result of strong nuclear force acting upon Helium) leading to a Planetary Nebula. To Electron Degeneracy Pressure resulting in a White Dwarf. Its life long nuclear struggle against gravity resulting in a remnant comparable to a celestial body three hundred thousand times the mass of our Earth compressed by unimaginable pressures into a white light emitting remnant with a mass comparable to the size of the Earth.

And to think that the pressure of electrons will hold up against the awesome force of gravity past the scheduled billions of years, one would be incorrect. As the electrons are compressed and smashed together melding with protons resulting in an even more almost incomprehensibly dense object known as a Neutron Star. With even more stellar possibilities one of which where electromagnetism takes center stage with emissions of magnificent beams of light, caused by accelerated electrons along the magnetic fields axis, fluttering into the vastness of the universe up to seven hundred times per second acting as the ultimate lighthouse. A Pulsar.

With so many other variables, variations, and outcomes our universe shows us its true magnificence with Neutron Stars. From Pulsars to Magnetars (a young Neutron Star with an ultra-sonic magnetic field a billion billion times the strength of Earth's) all apart of these amazing cyclical processes of gravitational force battling nuclear reactions that birth heavier elements from lighter ones.

I am proud to say, I am made of Star Stuff to pay homage to Carl Sagan.

© Thomas Hill
https://lh3.googleusercontent.com/-p-ggmtQFn9w/VdnNCfNpBXI/AAAAAAAAEcc/G4XP9M-GtNs/w506-h750/tumblr_mi0puqbcUi1r2h5u7o2_r1_1280.jpg
5 days ago - Via Google+ - View -
https://plus.google.com/112414072546607091789 abhay chauhan : ☼☼☼ SUN ☼☼☼ The Sun is the star at the center of the Solar System and is by far the most important ...
☼☼☼ SUN ☼☼☼

The Sun is the star at the center of the Solar System and is by far the most important source of energy for life on Earth.
Its diameter is about 109 times that of Earth, and it has a mass about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System. Chemically, about three quarters of the Sun's mass consists of hydrogen; the rest is mostly helium, with much smaller quantities of heavier elements, including oxygen, carbon, neon and iron.
The Sun is main-sequence star  based on spectral class and it is informally referred to as a yellow dwarf. It formed approximately 4.567 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became increasingly hot and dense, eventually initiating nuclear fusion in its core. It is thought that almost all stars form by this process. The Sun is roughly middle age and has not changed dramatically for four billion years, and will remain fairly stable for four billion more. However, after hydrogen fusion in its core has stopped, the Sun will undergo severe changes and become a red giant. It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury, Venus, and possibly Earth.
The enormous effect of the Sun on the Earth has been recognized since prehistoric times, and the Sun has been regarded by some cultures as a deity. Earth's movement around the Sun is the basis of the solar calendar, which is the predominant calendar in use today.
The Sun is viewed as a goddess in Germanic paganism, Sól/Sunna. Scholars theorize that the Sun, as a Germanic goddess, may represent an extension of an earlier Proto-Indo-European Sun deity due to Indo-European linguistic connections between Old Norse Sól, Sanskrit Surya, Gaulish Sulis, Lithuanian Saulė, and Slavic Solntse.

The Sun is by far the brightest object in the sky, with an apparent magnitude of −26.74. This is about 13 billion times brighter than the next brightest star, Sirius, which has an apparent magnitude of −1.46. The mean distance of the Sun to Earth is approximately 1 astronomical unit (about 150,000,000 km; 93,000,000 mi), though the distance varies as Earth moves from perihelion in January to aphelion in July. At this average distance, light travels from the Sun to Earth in about 8 minutes and 19 seconds. The energy of this sunlight supports almost all life on Earth by photosynthesis, and drives Earth's climate and weather.
Sunlight is Earth's primary source of energy.
https://lh3.googleusercontent.com/-2QiiEmkyi7Y/VbLXnV9RubI/AAAAAAAHY2c/GX8Rg-RqguM/w506-h750/SUN.gif
6 days ago - Via Reshared Post - View -
https://plus.google.com/104444289251323008732 Jernej Košir : Glossary Term of the Day! Main Sequence: A well-defined band on an H-R diagram on which most stars tend...
Glossary Term of the Day!
Main Sequence: A well-defined band on an H-R diagram on which most stars tend to be found, running from the top left of the diagram to the bottom right.

More on the H-R diagram: http://chandra.harvard.edu/edu/formal/variable_stars/bg_info.html
Chandra :: Educational Materials :: The Hertzsprung-Russell Diagram
Resources for teachers, parents, students and the public: Classroom activities, interactive games, printable materials and more resources are available.
6 days ago - Via Reshared Post - View -
https://plus.google.com/104575097087751649911 bharat chanda : The Sun is a G-type main-sequence star (G2V) based on spectral class and it is informally referred to...
The Sun is a G-type main-sequence star (G2V) based on spectral class and it is informally referred to as a yellow dwarf. It formed approximately 4.567 billion[b][17] years ago from the gravitational collapse of matter within a region of a large molecular cloud
SUN

8 days ago - Via Google+ - View -
https://plus.google.com/108989304512664110313 NASA's Chandra X-ray Observatory : Glossary Term of the Day! Mass-radius Relation: The dependence of the radius of a main-sequence star...
Glossary Term of the Day!
Mass-radius Relation: The dependence of the radius of a main-sequence star on its mass. The radius rises roughly in proportion to the mass.
9 days ago - Via Google+ - View -