Star Vanishes in Andromeda, Leaving a Black Hole Behind
Astronomers have witnessed a massive star in the Andromeda galaxy vanish, concluding it collapsed into a black hole without a supernova explosion.
#Astronomy#Black Hole#Andromeda Galaxy
#Andromeda Galaxy
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How a Single Star Observation in 1923 Revealed the Universe
On October 5, 1923, Edwin Hubble observed a variable star that proved the universe was far larger than the Milky Way, settling a major scientific debate.
#Edwin Hubble#Astronomy#History of Science