5. Black Widow Pulsar - Wikipedia
Link: https://en.wikipedia.org/wiki/Black_Widow_Pulsar
Description: The Black Widow Pulsar (PSR B1957+20) is an eclipsing binary millisecond pulsar in the Milky Way.Discovered in 1988, it is located roughly 6,500 light-years (2,000 parsecs) away from Earth.It orbits with a brown dwarf or Super-Jupiter companion with a period of 9.2 hours with an eclipse duration of approximately 20 minutes. When it was discovered, it was the first such pulsar known.