Question

Which one of the following planets has the shortest day?
1. Earth
2. Mars
3. Mercury
4. Venus

Answer 1

Correct Answer - Option 1 : Earth

Concept: 

• The sequence of planets according to their distance from the sun is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
• Mercury, Venus, Earth, and Mars are called terrestrial planets, and Jupiter, Saturn, Uranus, and Neptune are called gaseous planets. 

Earth:

• Among the given options Earth has the shortest day.
• A day is the length of time that a planet takes for the Sun to move from the noon position in the sky at a point on the equator to the same spot.
• Earth has 24 hours per day.
• Mars has approx 25 hours per day.
• Mercury has 4222.6 hours per day.
• Venus has 2802 hours per day.
• The planet that has the longest day is Mercury. 
• The planet Jupiter has the shortest day of all the eight major planets in the Solar System.
• It spins around on its axis once every 9 hr 55 min 29.69 sec. 

​Thus, Earth has the shortest day.