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Gravitational lenses

Predicted by Einstein and discovered in 1979, gravitational lensing helps astrophysicists understand the evolving shape of the universe.

At the 2017 APS Division of Particles and Fields meeting at Fermilab, Stanford scientist Daniel Gruen reported the year-one results from the Dark Energy Survey, including the most accurate measurement ever made of the present large-scale structure of the universe. You can view a video of Gruen’s talk, which is now available online.

Scientists on the Dark Energy Survey, using one of the world’s most powerful digital cameras, have discovered eight more faint celestial objects hovering near our Milky Way galaxy. Signs indicate that they, like the objects found by the same team earlier this year, are likely dwarf satellite galaxies, the smallest and closest known form of galaxies.

Scientists on the Dark Energy Survey have released the first in a series of dark matter maps of the cosmos. These maps, created with one of the world’s most powerful digital cameras, are the largest contiguous maps created at this level of detail and will improve our understanding of dark matter’s role in the formation of galaxies.