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Which black hole was the first to be photographed, in 2019?
Confirmed
The one at the center of galaxy M87
The Event Horizon Telescope linked radio dishes around the world to image the glowing ring around M87*.
About how much of the universe's total energy is the ordinary matter that makes up stars, planets and people?About how old is the universe?What is the cosmic microwave background?What is expected to happen to the Milky Way and the Andromeda galaxy in about 4 to 5 billion years?Roughly how much would a teaspoon of neutron star material weigh?About how old is the light we see from the Andromeda galaxy?