What, or when, would aliens see, if they looked at the earth?
Answers to Physics Questions
Physics, cosmology, astrophysics, electricity, energy, forces, gravity, light and maths...
17 May 2009
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Is it possible to do aerobatic stunts, such as a loop-the-loop or a barrel roll, in large passenger aeroplanes such as...
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We're constantly pulled this way and that by the gravitation of the Earth, the Moon and the Sun - but do we weigh...
26 April 2009
Can you keep your pipes clean and clear by applying a magnetic field?
19 April 2009
01 March 2009
How much energy is used when you do a Google search?
22 February 2009