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Largest Objects in the Solar System

With the help of a map, try to name the 35 largest objects in the Solar System by radius.
Source: Wikipedia
Map is not to scale.
Some objects are not well photographed, so their appearance is estimated.
Quiz by QuantumMechanist
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Featured Quiz
Last updated: June 7, 2025
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First submittedJune 21, 2020
Times taken118,305
Average score45.7%
Rating4.99
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Type
Mean Radius (km)
Answer
Star
695,700
Sun
Planet
69,911
Jupiter
Planet
58,232
Saturn
Planet
25,362
Uranus
Planet
24,622
Neptune
Planet
6,371.0
Earth
Planet
6,051.8
Venus
Planet
3,389.5
Mars
Jovian satellite
2,634.1
Ganymede
Saturnian satellite
2,574.7
Titan
Planet
2,439.4
Mercury
Jovian satellite
2,410.3
Callisto
Jovian satellite
1,821.6
Io
Terran satellite
1,737.4
Moon
Jovian satellite
1,560.8
Europa
Neptunian satellite
1,353.4
Triton
Dwarf planet
1,188.3
Pluto
Dwarf planet
1,163
Eris
Type
Mean Radius (km)
Answer
Dwarf planet
798 (ellipsoid)
Haumea
Uranian satellite
788.9
Titania
Saturnian satellite
763.8
Rhea
Uranian satellite
761.4
Oberon
Saturnian satellite
735.6
Iapetus
Dwarf planet
715
Makemake
Dwarf planet
~615
Gonggong
Plutonian satellite
606.0
Charon
Uranian satellite
584.7
Umbriel
Uranian satellite
578.9
Ariel
Saturnian satellite
561.7
Dione
Cubewano
543
Quaoar
Saturnian satellite
533.0
Tethys
Dwarf planet
469.7
Ceres
Plutino
~455
Orcus
Sednoid
~453
Sedna
Cubewano
~423
Salacia
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101 Recent Comments
Yeoryios
+6
Level 72
Aug 9, 2020
I forgot Mars...

100% got Mars......

QuantumMechanist
+9
Level 78
Aug 9, 2020
Congrats! You're in the zeroth percentile!
ChineseChen
+11
Level 67
Aug 10, 2020
I just killed everyone in the Solar System by missing the sun.
66plus44isnot100
+1
Level 19
Jun 6, 2025
The first* (as of now)
Serval
+2
Level 36
Mar 25, 2021
you think that's bad? I forgot the sun...
maple
+3
Level 52
Aug 9, 2020
Unfortunately I forgot of Ceres :(
methiony
+2
Level 28
Aug 19, 2020
vv nice quizz i love it <3333 great workkk
QuantumMechanist
+1
Level 78
Aug 20, 2020
Thanks!
66plus44isnot100
+1
Level 19
Jun 6, 2025
Less than three thousand three hundred thirty-three?
Dontforget
+2
Level 71
Aug 22, 2020
Ahaha the moon is guessed more than the sun apparently
QuantumMechanist
+9
Level 78
Aug 23, 2020
The sun obviously can't be in space because when you see it there aren't any stars around!
GrammarBeane1
+5
Level 83
Sep 3, 2020
I really appreciate how most moons are named after figures in Greek/Roman mythology, but then Uranus' moons are Shakespeare characters XD
Sibawayh
+7
Level 46
Sep 3, 2020
Why can't they name a moon Dave or Bill or something simple I can actually remember?
Regtheledge1000
+1
Level 28
Sep 3, 2020
Could you maybe accept “Chiron” for “Charon?
Relox84
+7
Level 69
Dec 29, 2020
That's just not the same thing
aloepottt
+1
Level 49
Jun 7, 2021
it was a joke.
vermiciousknid
+2
Level 90
Dec 26, 2023
Was it, though?
MrBubbles
+4
Level 67
Sep 3, 2020
I feel dumb. I got Iapetus but not Ceres.
kenpo17
+4
Level 66
Sep 3, 2020
I tried "your mom" as an answer but it wasn't accepted. Missed opportunity.
Sibawayh
+1
Level 46
Sep 3, 2020
gotem
FolgoreCZ
+1
Level 59
Sep 5, 2020
Should'use "yo mama." Probably just not enough type-ins. ;-)
66plus44isnot100
+1
Level 19
Jun 6, 2025
There is no such celestial body as "your mom."
driehoek25
+1
Level 68
Sep 3, 2020
I almost missed the sun.
tw4816
+2
Level 53
Sep 9, 2020
No way I didn't type in Sun
NotGoodAtCombat
+2
Level 37
Sep 10, 2020
Nice quiz! I got 23/35, almost missed mercury which would've been embarrassing
DiscoBayGolfer
+2
Level 79
Sep 16, 2020
To say this is impressive is an understatement...awesome job.
QuantumMechanist
+1
Level 78
Sep 16, 2020
Thanks!
undeadwarrior
+3
Level 65
Nov 18, 2020
Hilariously, I forgot Earth.
QuantumMechanist
+4
Level 78
Nov 18, 2020
To be fair, when we think of space we generally think of things outside Earth.
Hampus
+2
Level 56
Dec 9, 2020
You should accept Helios, Tellus, Luna...
QuantumMechanist
+5
Level 78
Dec 9, 2020
The quiz already accepts Luna. I've never heard any English speaker refer to the Sun in Greek and the Earth in Latin.
EcceHomo
+2
Level 84
Mar 23, 2021
Gaea then, :). Fabulous quiz QM. I must learn them all. But am I able to do it....??
66plus44isnot100
+1
Level 19
Jun 6, 2025
This quiz is in English. It does not accept Latin names for planets, stars, and other celestial bodies.
negreaves
+2
Level 27
Dec 29, 2020
when you remember that the sun exists after taking the quiz...
66plus44isnot100
+1
Level 19
Jun 6, 2025
Who would forget that the sun exists?
MyNameWasTaken
+5
Level 46
Apr 20, 2021
WTF is Gonggong and why am I laughing so hard right now
QuantumMechanist
+5
Level 78
Apr 21, 2021
Haha yeah this one made me laugh too. Gonggong is a water god in Chinese mythology. The International Astronomical Union's criteria for naming objects like Gonggong is that is must be named after a mythological figure pertaining to creation. Gonggong happened to be associated with water, ice, and the color red, which fit all the criteria. For a time after discovery before it was found to be red and when it just had a numerical name, its nickname was Snow White.
Sifhraven
+1
Level 73
Aug 16, 2024
Interesting, and there is a good chance after having read this I will remember the name now
PauloMX
+3
Level 66
Apr 22, 2021
Remember Bruno Mars!
nathanvdb
+3
Level 45
Aug 17, 2021
When you see that 8% of quiz takers dont know that the sun is called the sun :/
axkv2509
+5
Level 59
Sep 2, 2021
It cracks me up that there’s a dwarf planet called Makemake!
5708skier
+2
Level 53
Jul 14, 2022
It's pronounced mah-kay-mah-kay but yeah it's still funny.
66plus44isnot100
+1
Level 19
Jun 6, 2025
No, it's mocky-mocky.
andywave
+3
Level 60
Feb 23, 2022
Missed the sun, lmao
Cyphe
+2
Level 45
Jun 8, 2022
How did I get Quaoar but not Io
Findlay
+2
Level 81
Jun 16, 2022
I was wondering who the 8% of people who didn't get the sun in a quiz about objects in the SOLAR system were, but all of the confessions in the comment section more or less answer that one for me.
sumguy
+1
Level 86
Jun 19, 2022
When you talk things that are "in" the Solar System, you're thinking of things that are gravitationally bound by the Sun (Sol). The Sun is more than "in" the Solar System, it kind of is the Solar System, in that there is no Solar System without Sol.
Alexquiz17
+1
Level 93
Nov 11, 2024
Everything in the solar system originated from the same cloud of gas that condensed out with the sun at the centre. If the sun “is” the solar system, then so are the planets, moons and other weird objects that I first learned about from this quiz.
QuizApe
+3
Level 69
Jun 17, 2022
It scares me that 8% named all of the planets but not the Sun
Astana
+2
Level 52
Jun 19, 2022
Where did you get the map?
QuantumMechanist
+2
Level 78
Jun 19, 2022
I made it in Inkscape. Feel free to use it!
sumguy
+2
Level 86
Jun 19, 2022
Why are Haumea and Makemake listed as "Dwarf planet?" with a question mark? Haumea was declared a dwarf planet by the IAU on September 17, 2008, and Makemake was declared a dwarf planet on July 11, 2008.
QuantumMechanist
+2
Level 78
Jun 20, 2022
Hi,

Dwarf planet designation is in a weird place where several bodies are stuck being called a dwarf planet by one group of people and something else by another group, so I had a hard time figuring out the specifics.

It looks like you're right though, so I'll have that fixed.

Gamerboyscored
+2
Level 28
Sep 27, 2022
1:59 100%
GoEgRaPhY
+1
Level 32
Nov 5, 2022
8% of people forgot the sun XD
RJG
+1
Level 63
Feb 25, 2023
Even funnier 1% forgot the earth.
Dalminico
+2
Level 20
Feb 14, 2023
to the 2% of people that caused a meteor shower that ended the Earth. . .

well done for forgetting Jupiter :)

RJG
+2
Level 63
Feb 25, 2023
got 4 points of this surprisingly.
ItsLiamHere
+2
Level 38
Mar 2, 2023
great quiz mate

especially i just (under exaggeration) got into astronomy.

ItsLiamHere
+2
Level 38
Mar 10, 2023
Grreat quiz!

now make biggest stars or something :D

QuantumMechanist
+3
Level 78
Mar 10, 2023
Haha, I'd have a fun time making it but I don't think anyone would like that cause most of the answers would be RSGC1-F04.
NoOneCares
+1
Level 19
Aug 24, 2024
Yeah. There are Hypothetical Quasi Stars that would even swallow Uranus. Even the Port Cloud would be overheated if The Quasi Star would replace the sun. A quasi Star has a black hole as it's core and the Star slowly gets eaten by it.
rimeotheromeo
+3
Level 43
May 29, 2023
i kept on tying diome just to realise its dione
66plus44isnot100
+1
Level 19
Jun 6, 2025
typing* realize*
NEGeo
+2
Level 64
Nov 15, 2023
Thank you 13 Planets for well.. 13 of the answers!
Koopa
+2
Level 82
Dec 25, 2023
Love Senda.
QuantumMechanist
+1
Level 78
Dec 25, 2023
Me too.
66plus44isnot100
+1
Level 19
Jun 6, 2025
Sedna*
ed1969
+2
Level 72
Dec 26, 2023
Only 92% of takers guessed the sun? Hoo boy...
bn9043
+2
Level 64
Jan 29, 2024
lol i tried cerberus for ceres
66plus44isnot100
+1
Level 19
Jun 6, 2025
They're different. They're not the same mythological figure.
Woozie121
+2
Level 52
Apr 24, 2024
HOW THE HECK DID I GET EVERYTHING EXCEPT EARTH??!!
66plus44isnot100
+1
Level 19
Jun 6, 2025
You didn't get the planet you live on?
GeoNerd515
+3
Level 49
May 10, 2024
Thank you 13 Planets by Nat Geo :)
Ethman
+2
Level 43
May 30, 2024
no way i missed "moon"
bluesdjben
+2
Level 74
Jul 2, 2024
Excellent quiz!
AnimalAl
+2
Level 40
Jul 28, 2024
Fun quiz! Can you accept “Easter Bunny” for Makemake? It was the name they used to refer to it before they gave it the official name it has now.
QuizKoa
+2
Level 51
Jul 28, 2024
Incredible Quiz!!!!
quizzicalguy
+2
Level 68
Aug 9, 2024
How big would our screens need to be for the picture in the quiz to be to scale? Someone out there knows this and is dying to say it. My totally uneducated, mathless guess: 6km tall by 30 km wide.
QuantumMechanist
+2
Level 78
Aug 12, 2024
The solar system is about 6000 suns in diamaeter, but this is half, so about 6,000 * half the width of the sun. I'm pretty sure the measurement doesn't include Kuiper Belt objects. At its greatest distance, Sedna might be over 10,000 sun-diameters from the center.

The real answer is that Jetpunk scales the SVG map down to fit the page so it'd all just look like a bunch of dots.

66plus44isnot100
+1
Level 19
Jun 6, 2025
It doesn't need to be that tall.
NoOneCares
+1
Level 19
Aug 24, 2024
Fun fact: there is a hypothetical planet called Planet 9 like 600~ Astronomical Units away from sun. And if he is real, it would be slightly smaller than Neptune and would surpass Uranus in temperature and will be the New coldest planet in the Solar system. It also got suggested that it could be a black hole or a Asteroid. But there were 2 other Hypothetical Planets/stars: Nemesis and Tyche. They 2 got proven wrong. Nemesis should have been the Twin of the sun but flied away from reasons. Snd Tyche; idk. This planet just got proven wrong. But Vulcan would be an Interesting Theory tho
NoOneCares
+2
Level 19
Aug 24, 2024
Can you accept Terra for Earth? Quite many ppl use it and so do I.
QuantumMechanist
+1
Level 78
Aug 24, 2024
I don't think that's necessary. Everybody who knows the name Terra knows the name Earth as well.
ooftownroad
+1
Level 64
Mar 7, 2025
everybody who knows Luna knows moon too
66plus44isnot100
+1
Level 19
Jun 6, 2025
No you don't. You speak English, so you say "Earth."
Aegidrom
+1
Level 43
Oct 13, 2024
Why not accept the name for our earth? Tellus? Or even Terra. You accept the names for our sun and our own moon (Sol and Luna) so why not the name for our home planet as well?
Alexquiz17
+5
Level 93
Nov 11, 2024
Why not just type in earth? I guess some people are just too clever for their own good
66plus44isnot100
+1
Level 19
Jun 6, 2025
"Sol" is just the Spanish name for the sun, and "Luna" for the moon. If you speak English, you call it "Earth," not "Tellus."
Djaro
+2
Level 50
Jan 3, 2025
Very interesting subject matter, would never have learned all the dwarf planets and major moons without this quiz
In2restingFacts
+2
Level 24
Mar 3, 2025
as a young'un i was fascinated with them dwarf planets. you know that Mars isn't actually the reddest body in the solar system? Sedna is.
SlushyNoise
+1
Level 50
Mar 6, 2025
can we please add "your mom" as a joke?
66plus44isnot100
+1
Level 19
Jun 6, 2025
Okay, but how big is it?
FatRabbit
+2
Level 37
Mar 7, 2025
I swear I typed lapetus... twice even
66plus44isnot100
+1
Level 19
Jun 6, 2025
Maybe it was already entered.
Xtrordinary
+1
Level 72
Mar 9, 2025
Can we have Orcus, Gonggong, Sedna, and Quaoar be reclassified as dwarf planets? They seem to fit the IAU's definition and have been largely accepted by the astronomical community.
66plus44isnot100
+1
Level 19
Jun 6, 2025
Are you 100% sure that Sedna exists?
66plus44isnot100
+2
Level 19
Jun 6, 2025
How do only ninety-two percent of people know about the sun?
66plus44isnot100
+1
Level 19
Jun 6, 2025
More people got Earth than Jupiter? When you think of something in the solar system that is big (other than the sun), you think of Jupiter!
karammaster
+1
Level 17
Jun 18, 2025
Only 29% got Eris
karammaster
+1
Level 17
Jun 18, 2025
but you have a cool quiz

please make more quizzes about space

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