Which term refers to a cloud of dust and gas that collapses under gravity?

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Multiple Choice

Which term refers to a cloud of dust and gas that collapses under gravity?

Explanation:
Interstellar clouds of dust and gas that can contract under gravity are nebulae. Gravity pulls the material inward, increasing density and temperature until regions within the cloud collapse to form protostars and, eventually, stars. Nebulae are the stellar nurseries where many stars begin their lives. The other options refer to different objects: a galaxy is a vast system of stars, a meteor is a rock fragment burning up in Earth's atmosphere, and a comet is an icy body with a glowing coma and tail.

Interstellar clouds of dust and gas that can contract under gravity are nebulae. Gravity pulls the material inward, increasing density and temperature until regions within the cloud collapse to form protostars and, eventually, stars. Nebulae are the stellar nurseries where many stars begin their lives. The other options refer to different objects: a galaxy is a vast system of stars, a meteor is a rock fragment burning up in Earth's atmosphere, and a comet is an icy body with a glowing coma and tail.

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