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Our subscribers' grade-level estimate for this page: 6th - 7th
Table of Contents Enchanted Learning
All About Astronomy
Site Index
Our Solar System Stars Glossary Printables, Worksheets, and Activities
The Sun The Planets The Moon Asteroids Kuiper Belt Comets Meteors Astronomers

The Stars
Lifecycle Nuclear Fusion Brightest Stars Galaxies Other Solar Systems Constellations Why Stars Twinkle
Birth Death Star Types Closest Stars Nebulae Major Stars The Zodiac Activities, Links

The Birth of Stars The Death of Stars
Sun-like Stars
(Up to 1.5 times the mass of the Sun)
Huge Stars
(From 1.5 to 3 times the mass of the Sun)
Giant Stars
(Over 3 times the mass of the Sun)

THE LIFE CYCLE OF STARS

Stars are born in nebulae. Huge clouds of dust and gas collapse under gravitational forces, forming protostars. These young stars undergo further collapse, forming main sequence stars.

Stars expand as they grow old. As the core runs out of hydrogen and then helium, the core contacts and the outer layers expand, cool, and become less bright. This is a red giant or a red super giant (depending on the initial mass of the star). It will eventually collapse and explode. Its fate is determined by the original mass of the star; it will become either a black dwarf, neutron star, or black hole.





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