Many were curious about how methane ended up on Mars.
I'm pretty sure it was because of Uranus.
Methane on Mars: An Explanation
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Explanation
Explain Bear
Listen up, you chucklehead. You think methane just *appears* on Mars? No way! This joker is playin' on the fact that Uranus sounds like "your anus". So, methane, gas, you get it? It's a butt joke from outer space!