I always think of space-time as being the real substance of space, and the galaxies and the stars just like the foam on the ocean.

For many centuries, humans have speculated that there might be planetary systems around other stars and that there could be extraterrestrial life there and even intelligent being. However, those were simply speculations, and now we have evidence for the first part of these ideas.

There’s as many atoms in a single molecule of your DNA as there are stars in the typical galaxy. We are, each of us, a little universe.

Galaxies were mere tide pools. The empty space between them was a killing field of dark-matter predators and electromagnetic anglerfish.

There could be shadow galaxies, shadow stars, and even shadow people.

There are at least as many galaxies in our observable universe as there are stars in our galaxy.