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Chandra 101:
Overview for Teachers and Students
A Look at X-Rays
 Why do we need X-ray telescopes?
Much of the matter in the universe cannot be seen by any other telescope. X-ray
telescopes are the only way we can observe extremely hot matter with temperatures
of millions of degrees Celsius. It takes gigantic explosions, or intense magnetic
or gravitational fields to energize particles to these high temperatures. Where
do such conditions exist? In an astonishing variety of places, ranging from the
vast spaces between galaxies to the bizarre, collapsed worlds of neutron stars
and black holes.
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