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Muntain
by observing different stars in different stages of their formation
Protostar formation - The Birth of a starMain sequence - When it converts hydrogen into energyPost main Sequence - When they die.
Not exactly: Star formation is believed to be a slow process, compared to a human lifetime; scientists have, however, seen stars in different phases of their formation.
Planets are pieces of material that orbit a star such as the earth orbits the sun. Stars are 'suns' and are distributed throughout the universe. Stars are much larger than planets hence the reason that at night stars can be seen in the sky and planets cant even though the stars are much futher away than the other planets in our solar system.
Gravity doesn't just "affect" the formation of stars; it's just about the only force that CAUSES the stars to form in the first place.
the astronomers use Absolute magnitude
gravitation
No, they are ionized gases thrown off stars near the end of their fusion cycles. They are expanding clouds of matter, quite different from the nebulae in which stars form.
Gravity
When a certain formation of stars comes out.
1. What stages do stars go through?