Planet Lineup

Identify the mystery celestial body from progressive clues. The earlier you guess correctly, the more points you earn.

How to play

›You receive 3 clues about a mystery body, revealed one at a time
›Click the correct body in the solar system diagram to guess
›Clue 1 = 3 pts, Clue 2 = 2 pts, Clue 3 = 1 pt, Wrong = 0 pts
›Unlimited rounds — keep your session streak going

Choose difficulty

About Name That Planet

One clue at a time, guess the mystery world — a planet, a moon, or one of the 5 recognized dwarf planets. Clues get more specific as the round goes on, so guessing early on a vague clue ("I have rings") scores higher than waiting for the giveaway ("my rings are made of ice and rock, and I'm the least dense planet in the solar system" — that one's Saturn).

Every clue is drawn from real NASA data, so the guessing doubles as fact recall — mass, distance from the Sun, moon count, and other specifics you'll need to actually know, not just recognize.

Keep Exploring

More on identifying planets and dwarf planets

How to Identify Planets in the Night Sky

The naked-eye version of this game — spot Mercury, Venus, Mars, Jupiter, and Saturn by brightness and color.

Beyond Pluto: The 5 Dwarf Planets of Our Solar System

Pluto, Eris, Haumea, Makemake, and Ceres — the dwarf-planet clues in this game explained in full.