Their scientist host speculates that Earth may be the only planet in the entire universe whose moon covers its sun perfectly ( with only transits or occultations occurring on other planets ) .
Aliens visit Earth and observe a total solar eclipse .
Aliens ' scientist host speculates Earth Earth may be the Earth planet in the entire universe whose moon covers its sun perfectly ( with only transits or occultations occurring on other planets ) .
Aliens visit Earth and observe a total solar eclipse .