Question

Which planet is known as Red Planet?

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

Answer 1

The Correct Option is C

The correct option is (C): Mars.

Answer 2

The question asks which planet is nicknamed the Red Planet. The nickname comes from the planet's visible colour in the sky, caused by iron oxide (rust) covering its surface. Let's check each option.

1. Venus: Venus is covered by thick clouds of sulphuric acid that give it a bright yellowish-white appearance, and it is often called Earth's twin because of its similar size, not the Red Planet.
2. Mercury: Mercury is a grey, cratered rock with almost no atmosphere, closer in appearance to Earth's moon than to a red world.
3. Mars: Mars has large amounts of iron oxide dust on its surface, which scatters light in a way that makes the planet look reddish orange from space and even to the naked eye from Earth. This is exactly why it earned the nickname Red Planet.
4. Neptune: Neptune's atmosphere contains methane, which absorbs red light and reflects blue light, giving the planet a deep blue colour, the opposite of red.

Mars is the only planet in the list whose surface colour is caused by iron oxide, giving it a rust red appearance.

Therefore, the correct answer is Mars.

Answer 3

The question asks which planet earned the nickname "Red Planet." Since ancient civilisations named the planets after what they observed with the naked eye long before space missions existed, tracing how each of these four planets got its historical reputation helps confirm the answer.

1. Venus: Ancient observers noted Venus as the brightest object in the sky after the sun and moon, associating it with beauty and love, which is why it carries the name of the Roman goddess of love rather than any reference to colour.
2. Mercury: Mercury was named for its fast movement across the sky, resembling the swift messenger god, and observers never associated it with any particular colour since it is difficult to see clearly from Earth.
3. Mars: Ancient Egyptian astronomers called this planet "the red one," and later Roman observers named it after their god of war partly because its reddish glow in the night sky reminded them of blood, a naming tradition that persists in the modern "Red Planet" nickname.
4. Neptune: Neptune was not even visible to ancient observers and was only identified through telescopic and mathematical prediction in the nineteenth century, well after naming based on naked-eye colour had already been established for the other planets.

The naming history shows that Mars alone was singled out across multiple ancient cultures specifically for its reddish appearance in the sky, a reputation that continues in its modern nickname.

Therefore, the correct answer is Mars.