Comet

Comets consist of a solid nucleus made of rock, dust, ice, and frozen gases like carbon dioxide, carbon monoxide, and ammonia. They are thought to originate from the cold, dark outer regions of the solar system. Comets become visible when their elliptical orbits bring them close to the Sun, causing the frozen gases to vaporize.

What are the main components found in the nucleus of a comet?

• Hydrogen and helium gases

• Metallic core and silicate mantle

• Liquid water and organic compounds

• Rock, dust, ice, and frozen gases

Which of the following gases is NOT mentioned as part of a comet's composition?

• Ammonia

• Oxygen

• Carbon monoxide

• Carbon dioxide

Where are comets believed to originate from?

• The asteroid belt

• The cold, dark outer regions of the solar system

• The inner solar system

• The surface of planets

What causes comets to become visible from Earth?

• Their proximity to the Moon

• Their highly elliptical orbits bringing them close to the Sun

• Their interaction with Earth's atmosphere

• Their collision with asteroids

What happens to the frozen gases in a comet when it approaches the Sun?

• They solidify further

• They form new compounds

• They boil off and become visible

• They remain unchanged