Possible Clues:

• Small celestial bodies that move around the sun
• Heavenly bodies a hormone finally produces
• Heavenly bodies you get when having hormone injected
• Small planets orbiting the sun
• Atari game
• Source of active hormones for space travellers
• Do satires address small planets?
• Radio sets designed for space travellers
• As they're about a chemical compound, they're just a little in space
• Classic Atari game