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Stellar Evolution
The Milky Way galaxy contains several hundred billion stars of various ages, sizes and masses. A star forms when a dense cloud of gas collapses until nuclear reactions begin deep in the interior of the cloud and provide enough energy to halt the collapse
Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a few million years (for the most massive) to trillions of years (for the least massive), considerably more than the age of the universe. LEARN MORE »
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Sun: Death
Last Updated on 2009-12-09 at 12:35
Once our Sun began to produce energy in its core by fusing hydrogen into helium, it embarked on a long 'middle age.' As the nuclear fires became more efficient, the infant... More »
Interactive Tour: Stellar Evolution
Last Updated on 2009-12-09 at 12:23
The Milky Way galaxy contains several hundred billion stars of various ages, sizes and masses. A star forms when a dense cloud of gas collapses until nuclear reactions begin deep... More »
Stellar evolution
Last Updated on 2009-11-27 at 00:04
Stellar evolution is the process by which a star undergoes a sequence of radical changes during its lifetime. Depending on the mass of the star, this lifetime ranges from only a... More »
Stellar Evolution - A History of Discovery
Last Updated on 2009-11-26 at 22:28
In 1906, Karl Schwarzschild published a fundamental paper in astronomy, describing the appearance of an incandescent, stable ball of gas in considerable detail, using basic... More »
Sun: Middle Age
Last Updated on 2009-04-04 at 01:08
Once our sun began to produce energy in its core by fusing hydrogen into helium, it embarked on a long 'middle age' . As the nuclear fires became more efficient, the infant sun... More »
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