What Astronomers Wish Everyone Knew About Dark Matter

If you go by what's often reported in the news, you'd be under the impression that dark matter and dark energy are houses of cards just waiting to be blown down. Theorists are constantly exploring other options; individual galaxies and their satellites arguably favor some modification of gravity to dark matter; there are big controversies over just how fast the Universe is expanding, and the conclusions we've drawn from supernova data may need to be altered.

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