10.There are not a lot of oceans.

9.Space polar bears.

8.There are no fish in space.

7.Pirates.

6.No penguin bars.

5.Every time they lean forward their beaks break the glass visor in the space helmet and their guts get sucked out through their nostrils.

4.The cost of living.

3.It's hard to find matching wallpaper.

2.It's a nice place to visit, but...

And of course number 1...

There is no such thing as space penguins.

GO TO HELL!