[gaius]

Because when you assign a visible colour to a particular invisible wavelength, you can choose whatever colour you like. If you went there and looked with the naked eye, you'd see just black.

[mcantor]

Exactly. Since when is space less awesome than we think it is?

[InclinedPlane]

You wouldn't just see black, you'd see a different set of colors, generally more muted than the false-color pictures from telescopes.