If Earth had the same diameter as the head of a pushpin, how much would all of the other celestial bodies in the universe need to shrink to scale proportionally? It’s a fun, ridiculous question and ...

Visualizing the solar system in its totality requires one to conjure a lot of spinning bodies moving in synchrony. But getting a sense of those objects’ scale is just as important for developing a ...

Bigger than a planet? Smaller than an atom? Size comparison videos are all the rage and may scratch a very old itch. By Jenny Marder Not long ago, my 7-year-old son looked up from a picture he was ...