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Physics & Astronomy Facts

What does a piece of space dust look like? This picture shows one that is only 10 microns across. It was captured by a U2 aircraft in the stratosphere.
Uncharted Meteors

In 1967, NASA's Mariner 4 spacecraft was cruising through the solar system, not far from Earth, when something unexpected happened. 'Mariner 4 ran into a cloud of space dust,' says Bill Cooke of the M ...
Chandra image of the Vela Pulsar.
Neutron Stars

Ordinary matter, or the stuff we and everything around us is made of, consists largely of empty space. Even a rock is mostly empty space. This is because matter is made of atoms. An atom is a cloud of ...
X-rays can be produced by a high-speed collision between an electron and a proton.
X-Rays - Another Form of Light

A new form of radiation was discovered in 1895 by Wilhelm Roentgen, a German physicist. He called it X-radiation to denote its unknown nature. This mysterious radiation had the ability to pass through ...

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