Question

Which planet is known as Red Planet?

• A. Venus
• B. Mercury
• C. Mars
• D. Neptune

Hint:

Remember — Mars = Iron oxide = Red dust and soil.

Answer 1

The Correct Option is C

Mars is called the "Red Planet" due to the presence of iron oxide (rust) on its surface, which gives it a reddish appearance when observed from Earth. It is the fourth planet from the Sun and has been a prime focus for exploration because of its potential for past or present microbial life.
Options (A) Venus and (B) Mercury are terrestrial planets but lack the reddish surface. Option (D) Neptune is a gas giant with a blue hue.

Answer 2

The question asks which planet is known as the Red Planet. Let's look at each choice.

1. Venus: Venus is a terrestrial planet covered in thick yellowish clouds of sulphuric acid, giving it a pale, hazy look rather than a red one.
2. Mercury: Mercury is a small, rocky, grey-brown planet closest to the Sun, and it is not associated with a red colour.
3. Mars: Mars appears reddish because its surface is rich in iron oxide, the same compound that gives rust its colour, which is visible even from Earth with the naked eye. This is why it has earned the nickname Red Planet.
4. Neptune: Neptune is a gas giant that appears deep blue because of methane in its atmosphere, the opposite of a red appearance.

Only Mars has the iron-rich surface that produces its reddish colour, which is exactly the reason behind its popular nickname.

So the correct answer is Mars.

Answer 3

Each planet's characteristic colour comes from a different chemical or atmospheric cause, so comparing what actually gives each one its surface or atmospheric hue points straight to the answer.

1. Venus: Its pale yellowish appearance comes from a thick blanket of sulphuric acid clouds in its atmosphere, not from any red-toned surface material.
2. Mercury: This planet has almost no atmosphere and shows a grey-brown, cratered rocky surface, with no chemical process producing a red tone.
3. Mars: Its surface is coated in iron oxide, the same compound responsible for rust, and this iron-rich dust gives the whole planet its distinctive reddish colour visible from Earth.
4. Neptune: Its deep blue colour comes from methane gas in its atmosphere absorbing red light and reflecting blue, the chemical opposite of what produces Mars's colour.

Comparing the actual cause of each planet's colour shows that only Mars owes its appearance to an iron oxide surface, which is what earns it the Red Planet nickname.

So the correct answer is Mars.