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Curiosity rover takes snapshot of Earth -- from 100 million miles away on Mars

The Mars rover Curiosity does a test drill on a rock dubbed "Bonanza King" to see if it would be a good place to dig deeper and take a sample. But after the rock shifted, the test was stopped. The NASA rover has now spent two years on the red planet. Curiosity set off from Earth in November 2011 and landed nearly nine months later -- 99 million miles away. Click through to see more of its images. The Mars rover Curiosity does a test drill on a rock dubbed "Bonanza King" to see if it would be a good place to dig deeper and take a sample. But after the rock shifted, the test was stopped. The NASA rover has now spent two years on the red planet. Curiosity set off from Earth in November 2011 and landed nearly nine months later -- 99 million miles away. Click through to see more of its images.
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STORY HIGHLIGHTS
  • NASA releases a photo taken last week from the Curiosity rover on Mars
  • It shows a speck NASA says is the rover's first image of Earth from the red planet
  • Earth, its moon would be "two distinct, bright 'evening stars'" to observers on Mars, NASA says
  • Curiosity launched from Florida in fall 2011, landing on Mars the next August to study that planet

(CNN) -- It's a dot in the sky.

But not just any dot. For the Curiosity rover, it's home.

NASA tweeted a photo Thursday taken by Curiosity from the Mars surface six days earlier. The image shows a speck above the horizon that a pointer identifies as Earth.

"Look Back in Wonder," reads the accompanying text from the Curiosity Rover's official Twitter feed. "My 1st picture of Earth from the surface of Mars."

Jade Rabbit moon rover in trouble
Spotted: Mystery rock on Mars

If it's possible for a 1-ton, roughly SUV-size vehicle to get homesick, it's had plenty of reason to shed a tear. The last time Curiosity was on Earth was November 26, 2011, when it set off aboard a NASA spacecraft from Cape Canaveral, Florida.

NASA launches Mars rover

Eight and a half months and some 352 million miles later, the rover landed safely on Mars with its 17 cameras and other assorted scientific instruments all intact. And almost as quickly, the Curiosity -- the centerpiece of a $2.6 billion project -- began transmitting images back to Earth.

But until now, none of those pictures actually showed Earth itself.

The one released by NASA, which was "processed to remove effects of cosmic rays," was taken about 80 minutes after Mars' sunset with what researchers call Curiosity's "left eye camera" on its "Mastcam." It shows not just Earth but another dot that NASA says is our moon.

(Earth was about 99 million miles away at that point, according to NASA's Jet Propulsion Laboratory. Curiosity traveled a much longer distance to get to Mars because both planets are constantly in motion.)

Any Martian or Earthling who happened to be visiting wouldn't need such a special camera to see the same thing.

According to NASA, "A human observer with normal vision, if standing on Mars, could easily see Earth and the moon as two distinct, bright 'evening stars.'"

Of course, photographing its native planet isn't Curiosity's main mission, which is exploring Mars.

Since landing in Gale Crater, Curiosity has helped scientists determine that an area called Yellowknife Bay was habitable in ancient times.

Here, from the rim of the crater came stream waters that formed "a lake-stream-groundwater system that might have existed for millions of years," John Grotzinger, lead scientist on the Curiosity mission, wrote in last month's edition of the journal Science.

NASA: 2 places on Mars could have been habitable

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