Current
Dione
1,122.8 kmmean diameter · kmmean diameter · twice JPL's mean radius
Planet & Moon Size Blitz
Wrong answer? −3 seconds. Keep going until the clock hits zero.
Blitz Mode
Planet & Moon Size
Which world has the larger mean diameter?
Score00 Time left1:00
Your guess
Proteus
?mean diameter · kmmean diameter · twice JPL's mean radius
Make your call
3
Planet & Moon Size Blitz tips
In Planet & Moon Size Blitz you compare mean diameter · km under the clock. Correct guesses add to your score; wrong guesses cost three seconds. Choose 60 seconds for a sprint or 120 seconds if you want more room to recover from a bad read.
Compare mean diameter in kilometres, not mass or orbital distance. Large moons can rival small planets; rings are excluded and all values use twice the mean radius.
Your best Planet & Moon Size Blitz scores are saved locally for each duration. Beat your personal record, then compare against editorial targets on the Records page.