July 1, 1972
1 min read
The X-Ray Sky
More than 120 celestial X-ray sources are now known; the list includes at least one neutron star, one quasar, two galaxies, one double source and perhaps even a black hole
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July 1, 1972
1 min read
The X-Ray Sky
More than 120 celestial X-ray sources are now known; the list includes at least one neutron star, one quasar, two galaxies, one double source and perhaps even a black hole