This is the most famous picture of Earth, taken in 1968. And this article talks about what it was like for the astronauts on Apollo 8 who were supposed to be studying the moon, but just couldn't take their eyes off the Earth, as it rose on the moon's horizon. They've included a lot of pictures and video in this article. Check it out!
From the Big Bang article:
And Anders came to the realization, even during the flight, you know,
"My God, we've come all this way to study the moon
and its really the sight of the Earth that has had the most impact.
It's almost as if we're discovering the Earth for the first time."