Are we alone in the universe?
Why do placebos work?
Why do humans dream?
What's on the other side of a black hole?
How does gravity work?
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1) Don't know ,but we astronomers are yrying to find it, currently MARS is in our consideration.
4) A very strong gravity point through which anyone goes it undergoes spaghettigation process and is thrown at high speed far away either in another dimension or in parallel universe or anti time space.
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