The colour of the star is an indication of its temperature. The glowing is caused by something called Black-Body radiation, which has to do with the heat energy trying to radiate away in more and more energetic wavelengths. Red stars are relatively cool at only a few thousand degrees Celsius, white stars are hot at about ten thousand degrees, and blue stars are the hottest.

Correct Option: C

The colour of the star is an indication of its temperature. The glowing is caused by something called Black-Body radiation, which has to do with the heat energy trying to radiate away in more and more energetic wavelengths. Red stars are relatively cool at only a few thousand degrees Celsius, white stars are hot at about ten thousand degrees, and blue stars are the hottest.

Asteroids are rocky debris of varying sizes orbiting the Sun. Most of the asteroids are small but some have diameter as large as 1000 Km. There are millions of asteroids, many thought to be the shattered remnants of planetesimals, bodies within the young Sun's solar nebula that never grew large enough to become planets. The large majority of known asteroids orbit in the asteroids belt between the orbits of Mars and Jupiter, or are co-orbital with Jupiter. Asteroids vary greatly in size, from almost 1,000 Km for the largest down to rocks just tens of meters across.

Correct Option: A

Asteroids are rocky debris of varying sizes orbiting the Sun. Most of the asteroids are small but some have diameter as large as 1000 Km. There are millions of asteroids, many thought to be the shattered remnants of planetesimals, bodies within the young Sun's solar nebula that never grew large enough to become planets. The large majority of known asteroids orbit in the asteroids belt between the orbits of Mars and Jupiter, or are co-orbital with Jupiter. Asteroids vary greatly in size, from almost 1,000 Km for the largest down to rocks just tens of meters across.