Guns in Space, and How to Kill Our Sun

MinutePhysics showed us what would happen if the Earth were hollow, but that was just one part of the nerdy YouTube channel tag team this weekend. Here's the other half, wherein we learn how big a gun you'd need for the bullet to orbit the moon and hit you in the back of the head, and how to put out the Sun. (Please don't actually put out the Sun.) [YouTube]

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DISCUSSION

Another way to put out the sun would be to fling a ball of iron into it's core (something about the size of Saturn should do). The iron would stop all nuclear reaction and cause the sun to go nova.

Take THAT Death Star.