Enlarge / Artist’s impression of a supermassive black hole trailing stars behind it.NASA, ESA, Leah Hustak
If you saw a similar streak in one of your photos, you’d probably take a few moments to clean off the lens. But the streak, in this case, was in an image taken by the Hubble Space Telescope, which is not affected by the schmutz that daily life leaves on Earth-bound hardware. So, a team of researchers decided to figure out what the long, thin smear might represent.
They’re still not certain, but the best explanation appears to be the wake left behind by
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