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Physics
The branch of science concerned with the properties of matter and energy and the relationships between them.
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Physics > Astronomy 
black hole
Physics; Astronomy
An orbit in outer space that is so dense that its gravity will not let anything escape from it.
astrophysics
Physics; Astronomy
The scientific study of what happened inside stars and galaxies and how objects in space move in relation to each other.
Foucault pendulum
Physics; Astronomy
A pendulum that was made by Jean Foucault in 1851 to show that the Earth is rotating.
escape velocity
Physics; Astronomy
The speed at which an object, such as a rocket, must travel in order to escape from a planet's pull of gravity.
Tiangong-1
Physics; Astronomy
Tiangong-1 is China's first space laboratory, due to launch on September 29th 2012. It will launch unmanned and orbit the earth for a few weeks until Shenzhou 8 launches, when the ...
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