01/25/2024 |
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NASA/Aurore Simonnet (Sonoma State Univ.) |
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Credit: NASA, ESA, STScI, Alexa Gordon (Northwestern) |
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NASA/JPL/USGS Mars was once a much wetter world, with abundant water flowing across its surface. What happened to all that water? |
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paulista/Shutterstock. |
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Jim Schaff Our expert picks include wraparound shades and a solar telescope with backpack. |
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NASA, ESA, and J. Jee (University of California, Davis). Because dark matter has mass, it does interact with normal matter — including photons — via gravity. |
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Tommy Lease, taken from Parker, Colorado | Astronomy: Roen Kelly |
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