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These noctilucent clouds, reflecting light from the sun after sunset, have been visible in Martian skies for the past four fall seasons. Credit: NASA / JPL-Caltech / MSSS A rover got a new view of ...

In a groundbreaking study published in The Astrophysical Journal, astronomers have discovered high-velocity gas clouds near the M83 spiral galaxy, moving at velocities that differ sharply from the ...