NASA has this stunning video of the moon orbiting the earth from the point of view of the Deep Impact spacecraft, 31 million miles away. Just watching the earth rotate is impressive enough, even for someone raised on science fiction movies. But then: whoa! What’s that?! The moon passes through the scene. Wow.

It seems so simple, but it blows me away. I’ve lost track of how many times I’ve watched the video. I remain astonished by how big the moon is compared to the earth. Every time I watch it, I’m left with an overwhelming sense of how inconceivably huge the universe is. And here we are, just floating in it.