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Researchers are suggesting that the outer boundary of our home Milky Way galaxy may stretch much farther into the vastness of space than initially thought — and is in fact already touching its closest neighbor, the galaxy Andromeda., the international team of scientists posits a new definition for the boundary between interstellar space and the "circumgalactic medium," the cloud of gas that surrounds galaxies.
"We’re now seeing where the galaxy's influence stops, the transition where it becomes part of more of what’s surrounding the galaxy, and, eventually, where it joins the wider cosmic web and other galaxies," said Nielsen. "But in this case, we seem to have found a fairly clear boundary in this galaxy between its interstellar medium and its circumgalactic medium."
"In the CGM, the gas is being heated by something other than typical conditions inside galaxies, this likely includes heating from the diffuse emissions from the collective galaxies in the Universe and possibly some contribution is due to shocks," Nielsen explained.
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