Get facts about astronomy. Learn about the moon, sun, stars, planets, galaxies, and more.

Data from Comet 67P/Churyumov-Gerasimenko or the Rosetta Comet tells us how a comet smells. ESA/Rosetta/MPS for OSIRIS Team

What Does a Comet Smell Like?

The Rosetta probe made incredible discoveries about comets by taking measurements of  67P/Churyumov-Gerasimenko. Its ROSINA instrument (Rosetta Orbiter Sensor for Ion and Neutral Analysis) included two mass spectrometers that determined how a comet smells. If you think it smells like a dirty snowball, guess again (unless you find that snowball at […]

Why Sunglasses for a Solar Eclipse Are a Bad Idea

Everyone knows you shouldn’t look directly at the Sun. The rule also applies during a solar eclipse (except during totality). NASA and the media have done a great job explaining that it’s important to use special eclipse glasses to view the eclipse, but you may be wondering whether eclipse glasses […]

If you wear sunglasses for a solar eclipse, you could actually increase the risk of eye damage.

Place eclipse glasses or welder's glass over a cell phone to photograph a solar eclipse.

How to Use a Smartphone to Photograph a Solar Eclipse

Most of the solar eclipse photographs you see online and in the news were taken by professional photographers using digital cameras or telescopes, tripods, and filters. Often, many pictures taken under different conditions are combined to make a composite image that shows more detail that you could get from a […]

This spacewalk would have been a lot more interesting without the space suit and not necessarily fatal. (NASA)

What Really Happens If You’re Exposed to Space

Space Without a Space Suit Two of my most favorite science fiction movies of all time involve the main characters exposing themselves to low pressure. Ripley (Sigourney Weaver) spaces the alien in… well… probably every movie with her and the aliens, but Aliens is the best. Quaid (Arnold Schwarzenegger) spends […]