Put yourself in Curiosity's wheels for a moment. You're 99 million miles from where you were born. You can never go back. The only other creatures like you are somewhere else on a big planet, and you're unlikely to ever meet. You're doing amazing things for science and you're adored by millions. Still, you might want to take a picture of home for posterity.
That's just what Curiosity did, snapping its first picture of Earth and the moon from the surface of Mars. Though the two heavenly bodies are just pinpoints of light, they are still much brighter than any star seen through the Martian twilight.… Read more