Let's fly to outer space and learn some stellar space lingo.
Greenland is the largest island on earth.
Saturn is easily distinguishable from the other planets by its rings.
It is not known who the asteroid was named after.
Photosynthesis has made long-term life on this planet possible in the first place.
Also, the show's stars wanted to move on.
The lunar crater Holden and the Martian crater Holden were also named after Holden.
