Question

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.

Explanation:

• Stars form in nebular gas/dust clouds (1st statement: correct).
• Gravity pulls gas/dust together (2nd: correct).
• Sufficient mass cloud collapses, heats/densifies (3rd: incorrect, red giant is later; 4th: correct).
• Nuclear fusion from heat/pressure starts star birth (5th: correct).

Answer:

• Stars are born in clouds of gas and dust called nebulas.
• The gas and dust are pulled together by gravity.
• The pulled - together cloud collapses and becomes hot and dense.
• Heat and pressure cause nuclear fusion, which signals the birth of a star.