Question

Equatorial radius of which one of the following planets is closest to that of the Earth?

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

Hint:

Earth and Venus are often called "twin planets" because their size, radius, and mass are quite similar.

Answer 1

The Correct Option is B

Step 1: Recall Earth's equatorial radius. The Earth's equatorial radius is approximately: \[ 6378 \, \text{km} \]

Step 2: Compare with given planets. - Mercury: \(\sim 2440 \, \text{km}\) → much smaller. - Venus: \(\sim 6052 \, \text{km}\) → very close to Earth. - Mars: \(\sim 3390 \, \text{km}\) → smaller. - Neptune: \(\sim 24,622 \, \text{km}\) → much larger.

Step 3: Closest match. Among these, Venus has an equatorial radius closest to Earth.

Final Answer: \[ \boxed{\text{Venus}} \]