Working with Satellites

The ROSAT Satellite

Courtesy Max-Planck-Institut für
extraterrestrische Physik

Modern technology means that we can put special telescopes in space that can look at types of light that cannot get all the way through the atmosphere down to the ground (for example X-rays).

By observing stars and galaxies from satellites such as ROSAT (right) and from normal telescopes on the ground simultaneously (at the same time), we can tell a lot more about the objects than from separate measurements. It is often difficult to arrange such observations, but the