Seeing as the Earth is a puny nugget of metal sitting atop a nearly 2000 mile-thick mantle of high-pressure flowing rock, it’s no surprise that the rock occasionally seeps out, either slowly or explosively, through the surface. It’s pretty cool to see the magma glowing beside Sicily’s nighttime lights, though.
There are lots of things most of us never contemplate when we fantasize about living in space: What happens to your arms when they don’t naturally fall at your sides? Do you keep your callouses when you aren’t walking? What’s it like to sleep in free fall?