Two mysterious, translucent glass balls have been found on the far side ... "Impact glasses on the Moon are formed by cooling of impact melt and/or condensation of impact vapor, and impact glass ...

Mary Beth Griggs reports for Popular Science: From a reservoir heated to 1900 degrees Fahrenheit, the printer can lay down individual layers of melted glass, building it up into a finished sculpture.

Megan Treacy is a writer from Austin, TX. A former editor at EcoGeek, she worked as a technology columnist for Treehugger from 2012 to 2018. We've seen 3D printers make things from plastic ...