Question:medium

Which planet is known as Red Planet?

Updated On: Jul 15, 2026
  • Venus
  • Mercury
  • Mars
  • Neptune
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The Correct Option is C

Approach Solution - 1

Planets get their common nicknames from how they actually look in the sky, and this question is about the planet known for its red colour.

  1. Venus: Appears bright white or yellow because of dense cloud cover, not red.
  2. Mercury: A barren grey rock similar in look to the Moon, with no reddish tint.
  3. Mars: Its surface is rich in iron oxide, the same compound that gives rust its colour, so the planet glows reddish orange and has been called the Red Planet since ancient times.
  4. Neptune: Its methane-rich atmosphere reflects blue light, so it looks deep blue rather than red.

Since the red colour comes specifically from iron oxide on the Martian surface, the correct answer is Mars.

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Approach Solution -2

Working out which planet is called the Red Planet is really about knowing what colour each of these four planets actually appears from Earth and why.

  1. Venus: Wrong, because Venus's thick cloud cover of sulphuric acid droplets reflects almost all sunlight, giving it a brilliant white-yellow glow rather than red.
  2. Mercury: Wrong, because Mercury has essentially no atmosphere to scatter light in any particular direction, leaving its surface looking a dull grey similar to bare rock.
  3. Mars: Correct, because its thin dusty surface is saturated with rust-coloured iron minerals, and even without a telescope this dust gives the planet a distinctly orange-red tint visible from Earth.
  4. Neptune: Wrong, because methane gas in its upper atmosphere absorbs red wavelengths of light and reflects blue ones back, producing the planet's deep blue appearance.

Since only Mars actually looks reddish when observed, its surface colour alone is enough to identify it as the Red Planet.

Therefore, the correct answer is Mars.

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