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Planets - Multiple Choice

All the answers are planets in our Solar System. Can you guess the right one?
Quiz by Quizmaster
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Last updated: March 22, 2022
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First submittedMarch 20, 2022
Times taken41,826
Average score66.7%
Rating4.43
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1. What is the smallest planet in the Solar System?
Earth
Mars
Mercury
Venus
2. What is the largest planet in the Solar System?
Earth
Jupiter
Neptune
Saturn
3. Which planet is closest to the sun?
Jupiter
Mercury
Venus
Different planets at different times
4. Which planet is furthest from the sun?
Neptune
Saturn
Uranus
Different planets at different times
5. Which planet is closest to Earth?
Mars
Saturn
Venus
Different planets at different times
6. What is the hottest planet by average surface temperature?
Jupiter
Mercury
Uranus
Venus
7. Which planet is closest in size to Earth?
Mars
Mercury
Neptune
Venus
8. Which planet has exactly two moons?
Mars
Neptune
Uranus
Venus
9. Which planet is known as "Lucifer" or "The Morning Star"?
Mars
Neptune
Jupiter
Venus
10. Which of these planets is visible from Earth with the naked eye?
Jupiter
Mars
Saturn
All of the above
11. On which planet would you find the "Great Red Spot"?
Jupiter
Mars
Neptune
Venus
12. Which planet appears to move most quickly across the sky, when observed from Earth?
Mercury
Mars
Neptune
Saturn
13. Which of these is a picture of Jupiter?
14. Which planet has the most volcanoes, active or dormant?
Earth
Saturn
Uranus
Venus
15. Which planet was discovered by William Herschel in 1781?
Mercury
Mars
Neptune
Uranus
45 Comments
+5
Level 85
Mar 22, 2022
I'm surprised that the answer to 12 isn't "different planets at different times". When Mercury begins or ends a period of retrograde motion (as observed from Earth), it wouldn't seem to be moving "quickly across the sky, when observed from Earth".
+6
Level 61
Apr 4, 2022
I think this question is fine. Interpret it along the lines of "when a planet is moving as fast as any planet moves across the sky as seen from Earth, which planet is it?"
+2
Level 77
Feb 13, 2024
Think of it like "What's the fastest land animal?" It doesn't mean "What land animal is, right this moment, moving faster than any other," it means "What land animal is capable of moving the fastest?"
+11
Level 75
Mar 22, 2022
Current volcanic activity on Venus, while quite likely, has not yet been confirmed.
+2
Level 69
Mar 22, 2022
Right, and how would we make a fair comparison? Earth as a whole lot of volcanoes all around it.
+1
Level 61
Apr 4, 2022
Agreed. As far as we know, Venus has zero volcanic activity in modern times. The quiz has the wrong answer to this question.
+1
Level ∞
Apr 4, 2022
Sorry about that. Fixed the question.
+3
Level 49
Apr 4, 2022
I used to study space and this reminds me of how bad I’m at studying space
+1
Level 46
Apr 4, 2022
CGP Gray would beg to differ
+3
Level 75
Apr 4, 2022
Superb video by Lemmino about the planets recently:

https://www.youtube.com/watch?v=LhfCietvDZo

Apparenty around Herschel's time most astronomers assumed that the moon and the other planets had civilisations on them, and Herschel himself believed that there were people living on the Sun! I don't know if that's an interesting fact yet but it certainly shocked me!

+1
Level 28
Jan 24, 2023
oh man i didnt know lemmino still posted, the last time i watched his vids was during the rage comic days
+3
Level 71
Apr 4, 2022
I'm only 20, but the fact that Pluto isn't a planet anymore still messes with me. I was in elementary school shortly after the IAU demoted Pluto to dwarf planet, but my teachers were on the older side so we still talked about Pluto as though it was a planet. If I have so much trouble accepting this, I imagine it must be infinitely more difficult for people who have lived their entire lives with Pluto as the 9th planet.
+3
Level 53
Apr 4, 2022
I've lived most of my life with Pluto as a dwarf planet, yet as soon as I saw 'Smallest Planet' I thought of it.
+12
Level 81
Apr 4, 2022
I lived most of my life on Pluto so imagine how I feel when you Earthlings call it a dwarf planet
+4
Level 52
Apr 4, 2022
I'll always instinctively think there are 9 planets, but it's worth remembering Pluto was only discovered in the first place in the 1930s... and then Neptune before that in the 1840s. So it's always been in flux. Plus the "dwarf planet" category does make sense; there's what was previously classed as an "asteroid" in between Earth and Mars called Ceres which is a third the size of Pluto and, like a planet, is spherical. It's all a bit more complicated than they teach us in primary school.
+4
Level 76
Apr 8, 2022
I lived most of my life with the knowledge that Pluto was a planet, yet I had no problems accepting the new classification. Why? Cause it makes sense, and cause emotional attachments and tradition don't have a place in the natural sciences.
+2
Level 59
Jun 25, 2024
Pluto lived most of the time in my backyard, so imagine my effort to comfort him, when you called him a dwarf planet...
+1
Level 71
Jun 25, 2024
That's understandable--it's a child's fact. It doesn't actually matter. Gaining real knowledge is understanding that higher-order taxonomies are always arbitrary and anyone who has a strong opinion about them--what's a continent, a fish, a dinosaur, a planet--doesn't actually know very much about the subject.
+3
Level 45
Apr 4, 2022
Too Venus centric.
+8
Level 77
Apr 4, 2022
I believe the correct term is "venereal."
+1
Level 66
Apr 4, 2022
That old mnemonic, "My Very Excellent Mother Just Served Us Nachos" really came in clutch here
+2
Level 63
Jan 6, 2023
Unfortunately "My Very Easy Method Just Speeds Up Naming ___" isn't quite as good as when I learned it
+2
Level 57
Apr 4, 2022
The closest planet to Earth question was really smart. I instinctively clicked Venus because Venus' orbit is the closest to Earth's orbit, forgetting that when Earth and Venus are on different sides of the Sun Mars and maybe even Mercury could be closer. Only one I got wrong
+5
Level 14
Apr 5, 2022
You are absolutely right and the closest planet to Earth for the greatest proportion of the time is Mercury.
+1
Level 43
Apr 5, 2022
Ah yes, I forgot the planets don’t actually line up in a perfect straight line lol
+1
Level 63
Oct 19, 2022
"Um, Actually" 🤓
+1
Level 38
Apr 5, 2022
Viva Pluto - you will always be a planet in our hearts
+1
Level 59
Apr 5, 2022
14/15, way better than I expected! Wasn't sure about the morning star / Lucifer one, guessed Jupiter because I can't trust myself.

Cool quiz! 5 stars :)

+2
Level 34
Apr 5, 2022
Easy because I watch CGP Grey and I am very into space in general
+2
Level 58
Apr 6, 2022
So you would agree then that the proper name for Uranus is King George... right?
+2
Level 37
Apr 6, 2022
it has been proven that the orbits of both Uranus and Neptune cross over one another meaning that at different times Uranus is the farthest and at other times Neptune is the farthest
+3
Level 58
Apr 7, 2022
Farthest distance of Uranus from the Sun: 20.1 AU. Closest distance of Neptune to the Sun: 29.8 AU. Doesn't even come close. The pair you are thinking of is Neptune and Pluto, not Uranus and Neptune.
+2
Level 47
Apr 6, 2022
I was gonna say 'oh but Herschel discovered both planets' (or more accurately calculated Neptune) but I don't believe that happend in 1871 so you were indeed correct!
+1
Level 41
Apr 6, 2022
Regarding question 4, I was under the impression that Uranus and Neptune very occasionally swap places for (relatively) brief periods of time?
+3
Level 58
Apr 7, 2022
No, that's Neptune and Pluto. Pluto has a rather eccentric orbit, and for a little part of its orbit is closer to the Sun than Neptune.
+1
Level 23
Nov 15, 2022
Actually, Neptune and uranus swap for periods of time, so the answer should be different planets at different times.
+3
Level 77
Sep 21, 2023
They... don't, though. Ever.
+1
Level 65
Jun 25, 2024
That was what confused me. I had CGP Grey in my head arguing with old science textbooks and knew Neptune was involved but couldn't decide Pluto or Uranus
+1
Level 56
Jun 18, 2022
I love question 5.
+1
Level 20
May 21, 2024
got every question right
+1
Level 59
Jun 25, 2024
Didn't know that Mercury was the fastest-moving planet, but it makes sense when considering that Mercury's Greek counterpart is Hermes, god of travel. Very interesting.
+1
Level 40
Jun 25, 2024
how did I get 15/15
+1
Level 34
Jun 25, 2024
it's crazy how much you know about planets at one point in your life and as the tiides of time keep rolling..... you just forget.....
+1
Level 27
Jun 25, 2024
That felt so easy...
+1
Level 65
Jun 26, 2024
Mercury doesn't really go "across the sky". Not our sky anyway. It's too small and too far away. It's like if our perspective of the sun would be 1 inch across. Then Mercury would travel over 1.1 inches of OUR sky. Also, we can't see it because it is too close to the sun.