Pack
Solar System by size
Which world is bigger?
46 lotsUnlocks at level 9
Every lot is a planet, moon, dwarf planet or asteroid. Each duel is won by the larger diameter, revealed only in the arena.
Judged on
Every lot is compared on one number: Diameter.
Ratings are never shown. You bid on what you believe, then the arena reveals who was right.
How a match works
- Auction. Twelve of the 46 lots come up one by one. Both players start with twenty coins.
- Lineup. Each player secretly assigns their five lots to the five duels: Diameter.
- Arena. The duels play out. Win three of five, or take the bigger power share, and the match is yours.
All 46 lots in Solar System by size
- SunThe star with almost all the mass in the neighbourhood
- JupiterKing of the planets, with a storm older than telescopes
- SaturnThe ringed one, light enough to float in a big enough bath
- UranusRolls around the Sun on its side
- NeptuneBlue ice giant with the fastest winds anywhere
- EarthThe only one with sea turtles
- VenusEarth's hotter, angrier twin under acid clouds
- MarsThe red planet, home to more robots than people
- GanymedeJupiter's giant moon, bigger than Mercury
- TitanSaturn's haze-wrapped moon with lakes of methane
- MercuryClosest to the Sun, scorched by day and frozen by night
- CallistoJupiter's cratered old moon, quiet for billions of years
- IoJupiter's volcanic moon, pizza-coloured and restless
- The MoonOurs, and the only other world with footprints
- EuropaAn ocean under the ice, a favourite place to look for life
- TritonNeptune's backwards-orbiting captured moon
- PlutoDemoted planet with a heart on its face
- ErisThe discovery that got Pluto demoted
- TitaniaUranus's largest moon, named from a midsummer night's dream
- HaumeaEgg-shaped dwarf planet that spins in hours
- RheaSaturn's second-largest moon, icy and pale
- OberonThe fairy king among Uranus's moons
- IapetusTwo-tone moon with a ridge around its equator
- MakemakeA reddish dwarf planet named for an Easter Island god
- GonggongDistant dwarf planet named after a Chinese water god
- CharonPluto's companion, so big the pair waltz together
- UmbrielThe darkest of Uranus's big moons
- ArielThe brightest of Uranus's moons
- DioneSaturn's moon with wispy ice cliffs
- QuaoarA Kuiper belt world with a ring it shouldn't have
- TethysSaturn's moon with a canyon across its face
- SednaSo far out that one orbit takes millennia
- CeresQueen of the asteroid belt, a dwarf planet with bright salt spots
- OrcusThe anti-Pluto, on the mirror-image orbit
- VestaThe brightest asteroid, visible to the naked eye
- PallasA big lumpy asteroid on a tilted orbit
- EnceladusSprays its ocean into space through icy geysers
- MirandaUranus's patchwork moon with the tallest cliff known
- HygieaThe roundest of the big asteroids
- ProteusNeptune's dark, lumpy inner moon
- MimasSaturn's moon that looks like a certain battle station
- NereidNeptune's moon on a wildly stretched orbit
- HyperionA sponge-shaped moon tumbling chaotically
- PhoebeSaturn's captured moon, going the wrong way
- PhobosMars's potato-shaped moon, slowly falling in
- Halley's CometThe famous visitor's peanut-shaped nucleus