Cassiopeia

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Clumpy-looking supernova remnant Tycho captured by NASA's Chandra X-ray Observatory
science

Clumpy-looking supernova remnant Tycho captured by NASA's Chandra X-ray Observatory

Did the explosion itself cause this clumpiness, or was it something that happened afterward?

NASA's Fermi spots pulsar zipping through space at 4 million kilometres an hour
science

NASA's Fermi spots pulsar zipping through space at 4 million kilometres an hour

Pulsars are super dense, rapidly spinning neutron stars left behind when a massive star explodes.