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Question

Which one of the following astronomical objects is more massive than the Earth?

This question was previously asked in
CSIR NET 2019 Earth Science Question Paper (15-Dec-2019)
The correct answer is
Neptune

Massive Objects Comparison: Earth vs. Options

This question asks us to identify which of the listed astronomical objects possesses a greater mass than Earth. We need to compare the approximate masses of Neptune, Pluto, Venus, and Mars relative to Earth's mass.

Mass Comparison Data

The approximate masses of the celestial bodies relative to Earth's mass ($M_\oplus$) are:

  • Neptune: Approximately $17 M_\oplus$
  • Pluto: Approximately $0.0022 M_\oplus$
  • Venus: Approximately $0.815 M_\oplus$
  • Mars: Approximately $0.107 M_\oplus$

Identifying the Most Massive Object

By comparing these values to Earth's mass ($1 M_\oplus$):

  • Neptune ($17 M_\oplus$) is significantly more massive than Earth.
  • Pluto ($0.0022 M_\oplus$) is much less massive than Earth.
  • Venus ($0.815 M_\oplus$) is less massive than Earth.
  • Mars ($0.107 M_\oplus$) is less massive than Earth.

Therefore, Neptune is the only object listed that is more massive than the Earth.

Conclusion

The astronomical object among the choices that is more massive than Earth is Neptune.

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Important Questions from Planetary Bodies

  1. The correct sequence of planets in order of increasing surface temperature is:
  2. Atmosphere of planet Mars is almost entirely made up of $\text{CO}_2$. But the surface temperature of Mars is less than that of the Earth because:
  3. Consider two planets A and B with radii $2r$ and $r$, respectively. Let their distances from the Sun be $d$ and $2d$, respectively. The solar constants for A ($F_{\text{SA}}$) and B ($F_{\text{SB}}$) are related by
  4. Consider two planets 'A' and 'B' with the following characteristics. The relationship between $T_1$ and $T_2$ is
    Distance from the SunRadius of the planetIncident Solar flux densityEquivalent temperature
    Planet A$d_1$$r_1$$F_1$$T_1$
    Planet B$d_2 = 4d_1$$r_2 = 2r_1$$F_2$$T_2$
  5. Venus is closer to the Sun than Earth, and therefore solar energy incident on Venus is higher than that on Earth. However, the effective radiating temperature of Venus is lower than that of the Earth, because
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