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