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A pulsar draws material from its companion star.
Rossi X-ray Timing Explorer Solves Mystery of Pulsar 'Speed Limit'

Gravitational radiation, ripples in the fabric of space predicted by Albert Einstein, may serve as a cosmic traffic enforcer, protecting reckless pulsars from spinning too fast and blowing apart, acco ...
Hydra A is a galaxy cluster that is 840 million light years from Earth (redshift = .054). The cluster gets its name from the strong radio source, Hydra A, that originates in a galaxy near the center of the cluster.
Groups & Clusters of Galaxies

Galaxy clusters are the largest gravitationally bound objects in the universe. They have three major components: (i) hundreds of galaxies containing stars, gas and dust; (ii) vast clouds of hot (30 - ...

Powerful Quasars

Quasars appear as distant, highly luminous objects that look like stars. Strong evidence now exists that a quasar is produced by gas falling into a supermassive black hole in the center of a galaxy. Q ...

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