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Atmospheres can refract light, as light changes angle depending on the medium it passes through. Gravity actually bends light, as the space the light travels through is warped, in exactly the same way it bends matter. To be specific, it doesn't bend the light itself, but the space if moves through. So if the space around an object is curved toward it, that object would cause the paths of comets, atoms, particles, and photons to bend slightly toward it too.
Camping in Utah's sparsely populated desert areas provides opportunities to view the night skies with little light pollution. This view of the summer night sky was captured from the dry (well, muddy) bed of Sevier Lake in Utah's West Desert. The links in the bottom left corner provide access to a view with several constellations outlined. The winter night sky as seen from the Grand Staircase-Escalante National Monument brings with it the prominent constellation Orion. - Martin van Hemert <p style="text-align:right;color:#A8A8A8"></p>