Possible Clues:

• Radio set shaped like a star
• There's little of it going in space
• Space traveller employs a body-builder
• Radio-set broadcast from a minor planet
• Part of a belt
• Sun circler
• A minor planet
• Daisy has nothing which identifies a heavenly body!
• With a flower round, I'd contribute to the 30 across
• There's little of this in space