Earth is the Blue Planet because of the vast encompass of oceans on its surface. From space the oceans combined with the atmosphere makes the planet look blue. The abundance of water on Earth's surface is a unique feature that distinguishes the "Blue Planet" from others in the Solar System.

Correct Option: B

Earth is the Blue Planet because of the vast encompass of oceans on its surface. From space the oceans combined with the atmosphere makes the planet look blue. The abundance of water on Earth's surface is a unique feature that distinguishes the "Blue Planet" from others in the Solar System.

Venus is sometimes called as Earth's twin planet, in terms of size and composition. Like the earth, Venus is covered with thick clouds and has an atmosphere. There is almost the same amount of gravity on Venus but the pressure on the planet is about 100 times bigger than on Earth.

Correct Option: C

Venus is sometimes called as Earth's twin planet, in terms of size and composition. Like the earth, Venus is covered with thick clouds and has an atmosphere. There is almost the same amount of gravity on Venus but the pressure on the planet is about 100 times bigger than on Earth.

A supernova is a stellar explosion that is more energetic than a nova. During this short interval a supernova can radiate as much energy as the Sun is expected to emit over its entire life span. The explosion expels much or all of a star's material at a velocity of up to 30,000 km/s (10% of the speed of light).

Correct Option: C

A supernova is a stellar explosion that is more energetic than a nova. During this short interval a supernova can radiate as much energy as the Sun is expected to emit over its entire life span. The explosion expels much or all of a star's material at a velocity of up to 30,000 km/s (10% of the speed of light).

In the solar system, the orbit of Mercury is the most eccentric (that is, the least perfectly circular) of the eight planets. It orbits the Sun once in about 88 Earth days, completing three rotations about its axis for every two orbits.

Correct Option: A

In the solar system, the orbit of Mercury is the most eccentric (that is, the least perfectly circular) of the eight planets. It orbits the Sun once in about 88 Earth days, completing three rotations about its axis for every two orbits.

Mercury is the innermost planet (nearest to the Sun) in the Solar System. It is also the smallest, and its orbit is the most eccentric (that is, the least perfectly circular) of the eight planets. It orbits the Sun once in about 88 Earth days, completing three rotations about its axis for every two orbits.

Correct Option: B

Mercury is the innermost planet (nearest to the Sun) in the Solar System. It is also the smallest, and its orbit is the most eccentric (that is, the least perfectly circular) of the eight planets. It orbits the Sun once in about 88 Earth days, completing three rotations about its axis for every two orbits.