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This Nov. 16, 2017 image made with the Hubble Space Telescope shows the diffuse galaxy NGC 1052-DF2, lighter area in center. Several other galaxies can be seen through it. The unusual galaxy’s stars are speeding around with no apparent influence from dark matter, according to a study published on Wednesday, March 28, 2018 in the journal Nature. (P van Dokkum/NASA/ESA via AP)

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Tease photo

It's a double cosmic conundrum: Lots of stuff that was already invisible has gone missing.

By SETH BORENSTEIN, AP Science Writer March 29, 2018