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How do we know there are just 9 planets (including Pluto) in our Solar System? What if there are more?
is it possible for planets to fall out of orbit?
are human waste and food waste (including wrappers,ect) stored or used?
how long does it take for the anastronaut to reach the space station
are human waste and food waste (including wrappers,ect) stored or used? (1 comments)
if a person is trapped in a black hole what may happen? (1 comments)
how much would someone weigh on mars if they weighed 10 stone on earth? (1 comments)