A short animation of planets sizes PRESS Alt-A
If you see the outliner windows, you can find the panet's name. (Sorry, it's in french, but you can use google translation) Ciel=Sky, Jupiter = Jupiter, Lune = Moon, Mars = Mars, Mercure = Mercury, Neptune = Neptune, Saturne = Saturn, Soleil = Sun, Terre = Earth, Uranus = Uranus, Venus = Venus.
Which planet is that vast object in the background? Clearly an exoplanet, not something in our system. Or is it a brown dwarf star, looks about the right size for one?