Image description: NASA’s Cassini spacecraft captured this image of Earth and the moon from its perch in the Saturn system nearly 900 million miles away.
Pictures of Earth from the outer solar system are rare because from that distance, Earth appears very close to our sun. A camera’s sensitive detectors can be damaged by looking directly at the sun, just as a human being can damage his or her retina by doing the same. Cassini was able to take this image because the sun had temporarily moved behind Saturn from the spacecraft’s point of view and most of the light was blocked.
Image from NASA/JPL-Caltech/Space Science Institute.