5min chapter

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas cover image

170 | Priya Natarajan on Galaxies, Black Holes, and Cosmic Anomalies

Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

CHAPTER

Is There a Gravitational Lens in the Universe?

Most of the universe is kind of empty of matter, but there are regions where it's really concentrated. So when we look out into the night sky, nor the places where you would get dramatic light bending,. We can then look at the distort shapes you get from the stuff behind the lump versus the rest of the universe. And that is what gives us a calibration to back out how much matter there should have been in the sort of entire cylinderFrom our eyes all the way to where these galaxies, distant galaxies, are. It turns out this is one of the most compelling pieces of evidence for the existence of vast amounts of dark matter.

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