Jupiter Ring System Orbiting Neptune Asteroid Belt Kuiper Belt
186 million km/second 149 million km/second 299 million km/second 93 million km/second
Callisto Titan Io Ganymede
Deimos Leda Phobos Calypso
The Sagan Equation The Hoyle Equation The Hawking Equation The Drake Equation
Atlantis Enterprise Columbia Discovery
7 9 3 5
Binary planets Twin systems Double planets Biplanetary systems
Sputnik 1 WAC Corporal Explorer 1 V2 Missile
Europa Titan Io Mars