Which statements describe how stars are born? Check all that apply.Stars are born in clouds of gas and dust called nebulas.The gas and dust are pulled together by gravity.If the cloud that is pulled together has enough mass, a red giant is formed.The pulled-together cloud collapses and becomes hot and dense.Heat and pressure cause nuclear fusion, which signals the birth of a star.
Answer
A
Stars are born in clouds of gas and dust called nebulas.
B
The gas and dust are pulled together by gravity.
C
If the cloud that is pulled together has enough mass, a red giant is formed.
D
The pulled-together cloud collapses and becomes hot and dense.
E
Heat and pressure cause nuclear fusion, which signals the birth of a star.
Explanation
Stars begin in nebulas, clouds of gas and dust. Gravity pulls the material together, causing the cloud to collapse and grow hot and dense. When the core becomes hot and pressurized enough for nuclear fusion to begin, a star is born. A red giant is a later stage in a star’s life, not what forms directly from a collapsing cloud.
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