Why do most stars form in giant molecular clouds?
Quick Answer
Stars form in giant molecular clouds because those clouds are cold, dense, and rich in molecular hydrogen and dust. Gravity can then collapse clumps of gas into protostars.
The Full Story
Star formation begins in cold giant molecular clouds, which can contain enough material for thousands or even millions of Suns. Their low temperatures, often around 10 to 20 kelvin, let gravity overcome pressure in denser regions. Dust inside the clouds helps shield gas from starlight, allowing the gas to stay cool enough to collapse. As clumps contract, they heat up and eventually ignite nuclear fusion in their cores. Famous star-forming regions include the Orion Nebula and the Pillars of Creation in the Eagle Nebula.
Key Facts
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"Stars are born in cold, dusty clouds—not in empty space."