The closest known black hole to Earth is just 1500 light years away. It is orbited by a companion star similar to the sun, and if that star has planets, the black hole would be visible in their sky and about as bright as Jupiter.
PanSTARRS/El-Badry et almay have been found a cosmic stone’s throw from Earth, just 1500 light years away. Called Gaia BH1, it is estimated to be about 10 times the mass of our sun.
Although it can’t be seen directly because it emits no light, data from the European Space Agency’s Gaia space telescope revealed the gravitational tug the black hole exerts on its orbiting companion star, which is similar in age and mass to our own sun. …
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