This classic Facts So Romantic post was originally published in September, 2013. Roughly twice a year, the apparent positions of sun and moon coincide, and a fortunate few observers are treated to a solar eclipse. Watching such an event provides the opportunity to contemplate a strange coincidence: From the surface of Earth, the apparent sizes […]

Now that New Horizons has completed its flyby of Pluto, the spacecraft is on a long journey to become the fifth manmade object to leave the solar system. It does so carrying some curious human artifacts: a Florida state quarter, an American flag, and one ounce of the ashes of Clyde Tombaugh, who discovered Pluto […]

Before I could string full sentences together, I used to wander outside past my bedtime. I would push open the sliding glass door and immediately look up, searching for stars sprinkled beyond the silhouetted trees. At the time, I couldn’t even begin to comprehend what I was seeing. Instead, each beacon of light represented a […]

Our own oasis of life in the cosmos is blue, but will others be?

There is an unsolved problem I want to tell you about: The case of the missing Trojans. You might be thinking of the mythical horse with soldiers hidden inside. Or maybe you’re thinking of a sports team. Or a type of computer virus, or, let’s be honest, of the condoms. (Note that I said, “Case […]

There are two kinds of extraterrestrial life with very different implications.