JUAN CARLOS CASADO (STARRYEARTH.COM) / SCIENCE PHOTO LIBRARY JUAN CARLOS CASADO (STARRYEARTH.COM) / SCIENCE PHOTO LIBRARY
Mercury at sunset. Composite sequence at sunset showing the passage of Mercury through the sky over the course of several days. This sequence shows Mercury near the horizon over a period of 22 days. Since Mercury is so close to the Sun, it is only visible near the horizon at sunrise or sunset. Photographed near Figueres, Spain.
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