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Category Elimination - Solar system

In each group, name any answer which matches the first category to reveal the second category, then name any answer which applies to both categories to reveal a third, and so on. This quiz is about solar system objects: planets, moons, asteroids, anything floating out there.
Inspired by this series by Stewart !
What counts are named objects larger than 50km with some exceptions.
Quiz by
Relox84
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Last updated: September 7, 2021
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First submittedNovember 27, 2020
Times taken2,054
Average score68.8%
Rating4.29
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#
Category
✓
144
Planets and moons
✓
35
... that were visited by spacecraft
✓
5
... and were landed on
✓
1
... in the outer solar system
Titan
 
 
 
#
Category
✓
678
Minor planets
✓
24
... over 400km in diameter
✓
4
... that was once considered a planet
✓
1
... and was never visited by spacecraft
Pallas
#
Category
✓
136
Moons of the solar system
✓
71
... in the top half of its parent's largest moons
✓
7
... discovered in the 19th century
✓
1
... and not a gas giant's moon.
Phobos
 
 
 
#
Category
✓
822
Anything in the solar system, except the Sun
✓
30
... over 1000km in diameter
✓
25
... that was never (soft)landed on
✓
1
... in the inner solar system.
Mercury
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12 Comments
ThisistheJ17
+1
Level 44
Feb 26, 2021
No one has gotten this dang question my guy. I am avid into astronomy and even through just straight up looking up what the answer was, Pallas never showed up.
Relox84
+4
Level 69
Mar 4, 2021
This quiz is not intended to be trivial. For the specific question you’re referencing, I intentionally guided the previous clues towards a well known object and then switched to a lesser known one – I know we’re all different, but this type of thing is what I personally like about category elimination quizzes.

And if you’re not happy with this one which I understant, you can always go and make your own! That’s exactly what I did when I saw there wasn’t any about space, and being a fan of this typt of quiz I’ll be glad to see new ones popping!

And if you still don't know where Pallas comes from, check out this link: https://en.wikipedia.org/wiki/List_of_former_planets

mnsmr
+1
Level 66
Feb 24, 2026
You aren't that into astronomy if you didn't know that they were teaching 11-15 planets in the 1800s.
quizzer2
+1
Level 37
Aug 26, 2021
great quiz! just wondering... isn't the sun anything? because I typed that in and it didn't work...
Relox84
+1
Level 69
Sep 7, 2021
You're completely right, I'll add it in add a caveat for now. That question is the one I'm least satisfied with though, but I found it's quite hard to find original criteria to divide celestial objects.
AnimalAl
+1
Level 40
Mar 11, 2026
Probably because there were no divisions other than the absolute basics. Everything was either an asteroid or planet.

Because the IAU didn’t exist yet to throw a hissy fit at us having too many new objects.

YouLoveEagle
+1
Level 48
Jul 1, 2022
The thing is that I typed in Titan for the blue category but not the green category…
sumguy
+1
Level 87
Apr 20, 2024
We landed a probe on Titan??? How am I just learning about this? I was in the 5% who got Pallas, and have never heard of Huygens.
Smartypants3150
+1
Level 61
Apr 30, 2025
All the categories were pretty easy... minus one that we all collectively struggle with.
Relox84
+1
Level 69
May 30, 2025
It's pretty interesting trying to craft a balanced quiz and seeing how it actually balances out once relased.
nations12345eat
+1
Level 49
Aug 20, 2025
despite pallas once being considered a planet, is an asteroid, not a dwarf/minor planet
nations12345eat
+2
Level 49
Nov 19, 2025
i just learned this but a "minor planet" is any body that orbits the sun and is not a real planet or comet.

that includes dwarf planets and asteroids.

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