A recent exciting discovery concerns planets around 51 Pegasus . These systems contain solar mass stars, and possibly contain objects on the order of Jupiter. The former case has an orbit of around 2 A. U., which again is a little small for comfort. The large telescopes will allow much higher accuracy to be attained and thus allow much more sensitive searches to be carried out. There are objects in the Universe known as pulsars .
Pulsars are actually a manifestation of the exotic stars known as neutron stars .
This means that they have huge densities. Their densities are in fact roughly the same as that of the nuclei of atoms and so, in a sense, neutron stars are simply huge nuclei held together by gravity. An interesting property of neutron stars is that they have intense magnetic fields and that many of them rotate very quickly. This behavior manifests itself in an interesting way. This causes the light from such stars to vary periodically.