Possible Clues:

• The visitor from afar sounds as if having put on weight
• Measuring device capturing oxygen in Solar System body
• Sounds as if there's more meat for it if there's more space around it
• Has having been in space made one put on weight, by the sound of it?
• Part of a shower scene
• Traveller from afar is missing tiresome stranger
• Measure gold in extraterrestrial debris
• Happened upon fish eggs looking up part of shower!
• Streaker
• Heavenly body ran into Earth before first two in orbit