/u/rps_killerwhale's posts in /r/askscience

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Why can a theory never be proven?

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Is there any kind of visible eclipse when Mercury or Venus pass between the earth and the Sun? If not, why?

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Is there any kind of visible eclipse when Mercury or Venus pass between the earth and the Sun? If not, why?

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When a spaceship leaves the Earth it goes up, but at what point does "up" stop existing? Obviously in space there is no up or down. Have we tried going every direction into space?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why can a theory never be proven?	1
Is there any kind of visible eclipse when Mercury or Venus pass between the earth and the Sun? If not, why?	1
Is there any kind of visible eclipse when Mercury or Venus pass between the earth and the Sun? If not, why?	1
When a spaceship leaves the Earth it goes up, but at what point does "up" stop existing? Obviously in space there is no up or down. Have we tried going every direction into space?	1