There’s something about comparing the size of objects—say, moons or sci-fi starships—that is endlessly appealing. But while comparisons we’ve seen cover subsets of stuffs, none have looked at the big ...

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 ...

One thing that often gets lost in spacefaring titles like Destiny 2 is the scope of exactly how expansive space can be, along with how massive the objects flying around inside of it really are. One ...

According to Harvard astrophysicist Avi Loeb, the comet 3I/ATLAS likely weighs over 33 billion tons. This startling estimate was derived from an analysis of the object's trajectory, where Loeb ...

It’s probe-ably nothing. The newly discovered Manhattan-sized interstellar object zooming through our solar system has been identified as a comet — but two Harvard scientists argue there is reason to ...

Imagine describing the precise dimensions of a common object—like a coin—for another person. Did you move your hand, pretending to pick one up to show its size? If so, you likely weren’t alone. A new ...

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 ...