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We Might Be Able to Measure Dark Energy Through the Milky Way's Collision With Andromeda
The Milky Way and Andromeda are set to collide in a few billion years but are still over two million light-years apart. Cosmologically, this is right next door, but it could still be far enough to measure the effect of dark energy, which is pushing back on the galaxies coming together. According to a new study, the movement of the two galaxies towards each other could give an upper limit on the cosmological constant model of dark energy. Other merging pairs of galaxies could provide more data and help refine the measurements.
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