The Sun: Formation, Facts and Characteristicsįollow Nola Taylor Redd at Facebook, or Google+.Space Weather: Sunspots, Solar Flares & Coronal Mass Ejections.Solar Eclipse: What is a Total Solar Eclipse & When is the Next One?.Atmosphere of the Sun: Photosphere, Chromosphere & Corona.Combined with models, these observations can help tell us about the youth of our closest star. ![]() Astronomers learn about the life of the sun by studying the myriad of stars in the Milky Way. Of course, when the sun was born billions of years ago, no human scientists were around to study it. ![]() The star will never be hot enough to burn the oxygen and carbon that are left behind, so the sun will fizzle out and become a white dwarf. The helium at its core will also be consumed. Several billion years from now, the hydrogen inside of the sun will run out, and the star will swell up into a red giant with a radius extending to Earth's orbit. It is located in an outer spiral arm of the Milky Way galaxy called the Orion Arm, or Orion Spur. Its size makes it an excellent star to orbit, as it is neither large and fast-burning nor small and dim. Solar System Overview Our solar system has one star, eight planets, five officially recognized dwarf planets, at least 290 moons, more than 1.3 million asteroids, and about 3,900 comets. The sun is an average-size star, not too big and not too small. ![]() What was left continued to orbit the star, while planets formed from the leftover material. The formation of the sun didn't take up all of the cloud it was born from. "Our sun will stay in this mature phase … for approximately 10 billion years." "A star the size of our sun requires about 50 million years to mature from the beginning of the collapse to adulthood," according to NASA.
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