A Four-Month Orbit From Hell
15:20–16:11 · 51s
They reveal Markarian 501's binary has a 121-day orbital period and a separation of only hundreds of AU—mind-bendingly close for billion-solar-mass black holes.
15:20–16:11 · 51s
They reveal Markarian 501's binary has a 121-day orbital period and a separation of only hundreds of AU—mind-bendingly close for billion-solar-mass black holes.
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