Moons of the solar system

Are you a big astronomy nerd? Then this quiz is perfect for you! Your job is to guess all of the named moons of the 8 planets and dwarf planets of our solar system.

Major moons bolded

Only dwarf planets recognized by the IAU

Because some moons aren't spherical, they are listed with their average diameter

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Last updated: October 12, 2025

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First submitted	May 25, 2023
Times taken	375
Average score	42.4%
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Terran	dia.
Moon	3475

Martian
Phobos	22
Deimos	13

Plutonian
Charon	1212
Hydra	55
Nix	45
Kerberos	14
Styx	11

Haumean
Hi'iaka	310
Namaka	170

Eridian
Dysnomia	700

Jovian	dia.
Ganymede	5269
Callisto	4821
Io	3643
Europa	3122
Amalthea	167
Himalia	140
Thebe	99
Elara	80
Pasiphae	58
Carme	47
Metis	43
Lysithea	42
Sinope	35
Ananke	29
Leda	22
Adrastea	16
Callirrhoe	10
Themisto	9
Kalyke	7
Praxidike	7
Iocaste	5
Megaclite	5
Taygete	5
Aoede	4
Autonoe	4
Chaldene	4
Dia	4
Eirene	4
Eukelade	4
Isonoe	4
Harpalyke	4
Helike	4
Hermippe	4
Thyone	4
Aitne	3
Arche	3
Carpo	3
Erinome	3
Ersa	3
Euanthe	3
Eurydome	3
Hegemone	3
Pandia	3
Cyllene	2
Eupheme	2
Euporie	2
Herse	2
Kale	2
Kallichore	2
Kore	2
Mneme	2
Orthosie	2
Pasithee	2
Philophrosyne	2
Sponde	2
Thelxinoe	2
Valetudo	1

Saturnian	dia.
Titan	5149
Rhea	1527
Iapetus	1469
Dione	1123
Tethys	1062
Enceladus	504
Mimas	396
Hyperion	270
Phoebe	213
Janus	179
Epimetheus	116
Prometheus	86
Pandora	81
Siarnaq	39
Helene	35
Atlas	30
Albiorix	29
Pan	28
Telesto	25
Paaliaq	25
Calypso	21
Ymir	19
Kiviuq	17
Tarvos	15
Ijiraq	13
Erriapus	10
Daphnis	8
Hyrrokkin	8
Skathi	8
Thrymr	8
Bestla	7
Kari	7
Mundilfari	7
Narvi	7
Suttungr	7
Tarqeq	7
Aegir	6
Bebhionn	6
Bergelmir	6
Fornjot	6
Hati	6
Jarnsaxa	6
Loge	6
Surtur	6
Farbauti	5
Greip	5
Skoll	5
Alvaldi	4
Beli	4
Eggther	4
Fenrir	4
Geirrod	4
Gerd	4
Gridr	4
Gunnlod	4
Pallene	4
Skrymir	4
Thiazzi	4
Angrboda	3
Methone	3
Polydeuces	3
Anthe	2
Aegaeon	1

Uranian	dia.
Titania	1577
Oberon	1523
Umbriel	1169
Ariel	1158
Miranda	472
Puck	162
Sycorax	157
Portia	135
Juliet	94
Belinda	90
Cressida	80
Rosalind	72
Desdemona	64
Bianca	51
Prospero	50
Setebos	48
Ophelia	43
Caliban	42
Cordelia	40
Stephano	32
Perdita	30
Francisco	22
Margaret	20
Cupid	18
Mab	18
Trinculo	18
Ferdinand	12