QUESTION

# Which among the following is known as a red planet ?A. MarsB. Earth C. MercuryD. Venus

Hint: Planets are the celestial body moving in an elliptical orbit around a star (like sun). Because the sun is also a star.

As we know that the planets are the celestial bodies that are in the orbit around the Sun and have cleared the neighbourhood around its orbit.

And there are total eight major planets in our solar system and that were,

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

And red planet means that planet which appears red from the sky

Now we know that Mars is called a red planet because it appears in the sky as an orange-red star.

And Mars appears red in the sky because iron minerals in the Martian soil oxidize or we can say gets rusted, which causes the soil and atmosphere to look red. And, Mars has too much iron minerals and Martian soil oxide.

Hence, the correct option will be A.

Note: Mars has a thin atmosphere and that atmosphere is made up mostly of carbon dioxide ($C{O_2}$), argon (Ar), nitrogen (${N_2}$) and a small amount of oxygen and water vapour. And it is a rocky planet. And its surface is covered with Martian soil which reacts with oxygen to form Martian soil oxide which makes iron minerals rusted in Mars.