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Q48 (CDS-II/2012) Science & Technology › Space & Defence Technology › Space exploration missions Answer Verified

Which one among the following is called terrestrial planet?

Result
Your answer: —  Â·  Correct: A
Explanation

The planets in our solar system are classified into two primary groups based on their composition and location: terrestrial and giant planets. Terrestrial planets, also known as inner or rocky planets, are characterized by solid surfaces composed primarily of silicate rocks and metals like iron and nickel [4]. These planets include Mercury, Venus, Earth, and Mars [5]. Mercury is the smallest of these terrestrial planets and is located closest to the Sun [4]. In contrast, Jupiter and Saturn are classified as gas giants, while Uranus and Neptune are categorized as ice giants [5]. These outer planets are significantly larger, lack a solid surface, and are composed mainly of hydrogen, helium, and ices rather than rock [2]. Therefore, among the given options, only Mercury is a terrestrial planet.

Sources

  1. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > 2.4. Planets > p. 25
  2. [4] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > Inner Planets > p. 27
  3. [5] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > The Formation of the Planets > p. 18
  4. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 2: The Solar System > Outer Planets > p. 31
  5. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet > 13.2 What Do the Planets of Our Solar System Look Like? > p. 213
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