Astronomers study about universe and planets.
An astronomer is a scientist in the field of astronomy who focuses and studies the scope of Earth and universe.
The whole lifecycle of stars is studied microscopically by the astronomers. They obtain each and every thing to minute detail.
Thus, Astronomers learn about the internal structure and evolution of stars by using the technique called spectroscopy and also by observing their luminosity.
Star formation is the process by which the dense regions within any molecular clouds in the interstellar space, collapse and the result is the new star.
Thus, new stars form in nebulae, interstellar gases and dust clouds leftover from supernovas.
Supernovas is the phenomenon when a star has reached the end of its life and it explodes in a beautiful burst of light.
Thus, Supernovas are the results of stars running out of its nuclear fuels.
Lifespan is the total life from its evolution to its destruction. The lifespan of a massive star is shorter than a star like the Sun because massive stars have very high pressures and temperatures at their cores. Due to which, they burn their nuclear fuels faster. Stars grow larger as they become older.
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