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Pulsar
M1
This is the super nova remnant called the Crab Nebula. It is the expanding debris cloud from a star that exploded in 1054 and was observed by Chinese Astronomers. At the core of this cloud is a neutron star which is to small to see with most telescopes. The typical size of neutron stars is about 12 miles radius and one cup full of neutron star would weigh millions and millions of tons. This is the famous Crab Pulsar (PSR BO531+21). The Crab pulsar spins 30 times a second and doesn't fly apart because of its enormous dense gravitational attraction. Radiation is beamed out along its magnetic poles and when it crosses the earth we can detect the pulses. Here is the incredible sound the Crab Pulsar makes.