Calcium in our Bones + Teeth was Created by Exploding Stars

Reinforcing the often-shared sentiment that we are all made of stars (popularized by astronomer Carl Sagan), a new study published in The Astrophysical Journal posits that half of the calcium found in the known universe—including inside human bones and teeth—originated from stars exploding in supernovas. An international team of nearly 70 scientists collaborated on the findings, after an observation of an “anomaly” by amateur astronomer Joel …

How to Assemble a Night Sky on Your Ceiling

There are “170 billion galaxies, spanning 45.7 billion light years,” and “roughly a septillion stars in the observable universe.” While few venture out there, many more of us can enjoy the splendor of the night sky from porches, backyards, mountaintops or—as an article from The New York Times suggests—even your bedroom. Their helpful guide explains how to cast the night sky onto your ceiling. Resources …

High-Definition Video of the Sun’s Strange Surface

Captured using Hawaii’s Daniel K Inouye Solar Telescope (the world’s largest), this high-definition video of the sun’s surface is the closest observation earthlings have ever seen. Comprised of cell-like eruptions marked by bright centers and darker outlines, this particular swatch of the sun comprises 200 million square kilometers, and each individual “cell” is equal to the size of France. The first of many videos to …