Stars are formed from giant clouds of gas and dust called nebulae.
The most common type of star formation is called the "gravitational collapse" model.
The process of star formation can take millions of years.
Stars are classified based on their size, temperature, and brightness.
The most massive stars can be up to 100 times larger than our sun.
Stars can be born alone or in groups called star clusters.
The Orion Nebula is one of the most active regions of star formation in our galaxy.
The birth of a star is marked by the ignition of nuclear fusion in its core.
Some stars, known as brown dwarfs, are too small to ignite nuclear fusion and never become true stars.
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