Astronomers discover new supergiant fast X-ray transient, expanding rare class
Italian astronomers report the detection of a new X-ray binary (XRB), which has received the designation 4XMM J181330.1-17511 ...
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Leavitt discovers a correlation between Cepheids' period and luminosity
The brighter the star is overall, the longer the period of luminosity. Since the cepheids in the Magellanic Clouds were all about the same distance from Earth, Leavitt concluded that the period ...