Venus,
Mars, and other planets can appear as “evening stars”s in our skies, depending
on your location and the time of year. On January 31, 2014, Earth played the
same role for an earthling on Mars. NASA’s Curiosity rover turned its Mast
Camera toward the horizon and snapped this photo of home.
Earth
is just barely visible (image top-center-left), just above the dim glow of
twilight near the Martian landscape. The image was captured about 80 minutes
after sundown on the rover’s 529th day, or sol, on the red planet.
Curiosity
and Mars were about 160 million kilometers (99 million miles) from Earth at the
time, and the Big Blue Marble or Pale Blue Dot looked more like a faint white
speck in this view. However, a human observer with normal vision, if standing
on Mars, could easily see Earth and its moon as two distinct “evening stars.”
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