Why is outer space so clean?

It's a vacuum!

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What do you call it when cows do battle in outer space?

Steer Wars.

Why didn't the dog want to go into outer space?

Because he was scared of vacuums!

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Why do dogs hate outer space?

Because they strongly dislike vacuums.

How do Astronauts screw in a lightbulb?

They don't: They screw in a vacuum.