General Knowledge Quiz

Posted by Allcbts Ola · 29th Jun 2026, 9:21 AM · 174 views

Which planet has the shortest day (fastest rotation) in the Solar System?

A. Saturn
B. Jupiter
C. Mars
D. Neptune

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By Allcbts Ola · 29th Jun 2026, 9:23 AM

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Discussion Comments

Emmanuel Oyeleke · 29th Jun 2026, 11:21 AM

The correct answer is B. Jupiter.

Agnes Mary · 29th Jun 2026, 11:22 AM

I agree with you

Agnes Mary · 29th Jun 2026, 11:23 AM

I agree with you

Emmanuel Oyeleke · 29th Jun 2026, 11:21 AM

Even though Jupiter is the largest planet in our solar system, it spins the fastest.
A single day on Jupiter (the time it takes to rotate once on its axis) lasts only about 9 hours and 56 minutes.
Because it spins so rapidly, the planet actually flattens out slightly at the poles and bulges at its equator

Agnes Mary · 29th Jun 2026, 11:24 AM

Thanks for your explanation

Agnes Mary · 29th Jun 2026, 11:24 AM

B.jupiter

Agnes Mary · 29th Jun 2026, 11:27 AM

Because Jupiter is the largest planet, it pulled in a colossal amount of gas and dust from the early solar system. Gathering all that mass into one concentrated space caused its rotation to accelerate dramatically.

Agnes Mary · 29th Jun 2026, 11:48 AM

Am totally sure 😃

Agnes Mary · 29th Jun 2026, 11:27 AM

Saturn: About 10 hours and 33 minutes (the second fastest!).

Agnes Mary · 29th Jun 2026, 11:28 AM

Neptune: About 16 hours.

Agnes Mary · 29th Jun 2026, 11:28 AM

Mars: About 24 hours and 37 minutes (very close to Earth's day length).

Agnes Mary · 29th Jun 2026, 11:29 AM

Bonus Fact: Venus has the longest day in the solar system. A single day on Venus lasts about 243 Earth days—which means a day on Venus is actually longer than its year!

Jaiyeola Ayomide · 29th Jun 2026, 11:33 AM

B is the correct answer

Agnes Mary · 29th Jun 2026, 11:37 AM

Correct 💯

Jaiyeola Ayomide · 29th Jun 2026, 11:34 AM

Rotation means a planet spinning around its own axis (like a spinning top).
One complete spin equals one day on that planet.
Therefore, the planet that spins the fastest will take the least amount of time to complete a rotation, giving it the shortest day.

Agnes Mary · 29th Jun 2026, 11:37 AM

Agree

Jaiyeola Ayomide · 29th Jun 2026, 11:35 AM

Jupiter

Agnes Mary · 29th Jun 2026, 11:37 AM

Yes

Agnes Mary · 29th Jun 2026, 11:47 AM

Comparing the times, Jupiter takes the absolute shortest amount of time to finish one rotation.
That makes B. Jupiter the correct choice.

Agnes Mary · 29th Jun 2026, 11:50 AM

1. Rotation (Day)
A Day (Rotation): This is the time it takes for a planet to spin around its own center axis once. Jupiter spins incredibly fast, completing a full rotation in just 9 hours and 56 minutes.

Agnes Mary · 29th Jun 2026, 11:50 AM

A Year (Revolution): This is the time it takes for a planet to travel all the way around the Sun. Because Jupiter is far away from the sun, its year is very long—about 12 Earth years.

Agnes Mary · 29th Jun 2026, 11:51 AM

Because Jupiter spins at a blinding speed of about 45,300 km/h at its equator, it experiences massive centrifugal force. This force pushes the middle of the planet outward.
If you look at a diagram of Jupiter, it is not a perfect circle:
The equator bulges out widely.
The poles (top and bottom) are flattened down.
This shape is called an oblate spheroid.

Agnes Mary · 29th Jun 2026, 11:51 AM

Fastest Rotation = Shortest Day = Jupiter (~10 hours)

Agnes Mary · 29th Jun 2026, 11:52 AM

Slowest Rotation = Longest Day = Venus (~243 Earth days)

Agnes Mary · 29th Jun 2026, 11:52 AM

Slowest Rotation = Longest Day = Venus (~243 Earth days)

Agnes Mary · 29th Jun 2026, 11:52 AM

Shortest Year (Fastest orbit around Sun) = Mercury (88 Earth days)

Agnes Mary · 29th Jun 2026, 12:08 PM

The Ice Skater Effect: As Jupiter formed, it pulled massive gas inward, making it spin faster (like a skater pulling in their arms).

Agnes Mary · 29th Jun 2026, 12:08 PM

No Friction: It is made of gas and liquid, so it has no solid crust to create friction and slow the spin down.

Agnes Mary · 29th Jun 2026, 12:08 PM

Massive Energy: Being the largest planet, it absorbed the most rotational energy from the early solar system.

Agnes Mary · 29th Jun 2026, 12:09 PM

Oblate Shape: It spins so fast that the planet flattens at the poles and bulges at the equator.

Agnes Mary · 29th Jun 2026, 12:09 PM

Fluid Layers: Because it is fluid, the equator spins slightly faster than the top and bottom.