Which celestial objects are formed by the condensation of interstellar gas?

Which celestial objects are formed by the condensation of interstellar gas?

• A. Planets
• B. Stars
• C. Asteroids
• D. Comets

Answer: (B)

When gas in space cools and contracts under gravity, it can form stars. In giant molecular clouds, regions become dense enough that gravity overwhelms internal pressure, causing collapse. As the cloud collapses, it heats up at the center and a protostar forms; with continued accretion and eventually nuclear fusion igniting, a star is born. This process is driven by gravity and cooling of interstellar gas, not by assembling solid bodies from debris. Planets form later, from dust and gas in a disk around a new star, gathering material rather than condensing directly from interstellar gas. Asteroids and comets are remnants from the early solar system, not products of the initial gas-condensation star-formation process.

When gas in space cools and contracts under gravity, it can form stars. In giant molecular clouds, regions become dense enough that gravity overwhelms internal pressure, causing collapse. As the cloud collapses, it heats up at the center and a protostar forms; with continued accretion and eventually nuclear fusion igniting, a star is born. This process is driven by gravity and cooling of interstellar gas, not by assembling solid bodies from debris.

Planets form later, from dust and gas in a disk around a new star, gathering material rather than condensing directly from interstellar gas. Asteroids and comets are remnants from the early solar system, not products of the initial gas-condensation star-formation process.