Please don't write "listed below" if you don't provide the list. That just wastes everybody's time.
Gravity
Gravity.
i don't konw?
by observing different stars in different stages of their formation
The Main Sequence
Scientists believe that the clumping together of matter to form the first stars after the Big Bang was primarily due to the force of gravity. Gravity caused regions of slightly denser matter to attract more matter towards them, leading to the formation of proto-stars. Over time, these proto-stars accumulated enough mass and pressure to ignite nuclear fusion, giving birth to the first stars in the universe.
Gravity
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.
Gravity.
The primary fuel for all stars is hydrogen
gravitation
When a certain formation of stars comes out.
1. What stages do stars go through?
The Southern Cross
the solar role
reflection
They initiate new star formation. Therefore they are responsible for the formation of new stars.
Planets and stars have gravity.