Why is outer space so clean?

It's a vacuum!

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Why didnt Spock make a record of their voyage?

Because it was deep space . (the joke is how the outer space was very deep)

Why do dogs hate outer space?

Because they strongly dislike vacuums.

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Why does no one care that space is a vacuum?

Oh it doesn't really matter.

How do Astronauts screw in a lightbulb?

They don't: They screw in a vacuum.