Which planet has the longest day in the solar system?
Show answer & explanation
Correct answer: A
Explanation
Answer: Venus
Explanation
The planet with the longest day in the solar system is Venus.
Venus rotates extremely slowly on its axis
One full rotation (a “day”) on Venus takes about 243 Earth days
Interestingly, a day on Venus is longer than its year (225 Earth days)
This slow retrograde (backward) rotation is why Venus has the longest day.
Additional Key Points
Venus rotates in the opposite direction compared to most planets (retrograde rotation)
Thick atmosphere causes extreme heat and pressure
Surface temperature is around 465°C
Known as Earth’s “twin” due to similar size, but very different conditions
No natural satellites (moons)
Potential Questions & Answers
Q. Which planet rotates the fastest in the solar system?
Ans: Jupiter
Q. Why is Venus’s day longer than its year?
Ans: Because it rotates extremely slowly on its axis