menu
close
subscribe donate

Christopher Crockett

Christopher Crockett

Christopher has a Ph.D. in astronomy from the University of California, Los Angeles. After eight years of searching for exoplanets, probing distant galaxies and exploring comets, Chris realized he enjoyed talking about astronomy a lot more than actually doing it. After being awarded a 2013 AAAS Mass Media Fellowship to write for Scientific American, he left a research career at the U.S. Naval Observatory to pursue a new life writing about anything and everything within the local cosmological horizon. Since 2014, he's been working with Science News.

Word of the week: Electromagnetic spectrum

Posted by in Space | 3 days ago
Posted by

The electromagnetic spectrum describes all the wavelengths of light, both seen and unseen.

What is the zodiac?

Posted by in Astronomy Essentials | Human World | Space | 8 months ago
Posted by

Maybe you associate the word ‘zodiac’ with astrology, but it has an honored place in astronomy, too. It’s defined by the annual path of the sun across our sky.

What is a parsec?

Posted by in Space | 12 months ago
Posted by

Why do professional astronomers speak of distances in the universe not in terms of light-years, but in terms of parsecs, a distance of 3.26 light-years? Explanation here.

What is a coronal mass ejection?

Posted by in Space | 1 year ago
Posted by

Want to brush up on your knowledge about these solar hiccups – CMEs, for short – that can ripple through our solar system and can interrupt satellites and power grids on Earth?

What is retrograde motion?

Posted by in Astronomy Essentials | Space | 3 years ago
Posted by

Retrograde motion of Jupiter or Mars or Saturn in our sky is an illusion, caused by Earth’s passing these slower-moving outer worlds. But there’s a real retrograde motion, too.
Sun's path through the zodiac.

Ecliptic traces the sun’s path

Posted by in Astronomy Essentials | Space | 3 years ago
Posted by

The ecliptic is an imaginary line that marks the path of the sun. The signs of the Zodiac come from the constellations that lie along this line.
Gamma ray burst

What are gamma ray bursts?

Posted by in Space | 6 years ago
Posted by

Only the most powerful explosions in the universe.

What is a light-year?

Posted by in Space | 7 years ago
Posted by

Hint: A light-year is a unit of distance, not time.
Eta Carinae

Wolf-Rayets are the most massive and brightest stars known

Posted by in Space | 7 years ago
Posted by

Wolf-Rayet stars make our sun look tiny. They can be hundreds of times more massive, millions of times brighter, and tens of thousands of degrees hotter.

Elliptical galaxy ESO 325 G004

What are elliptical galaxies?

Posted by in Space | 7 years ago
Posted by

Elliptical galaxies are among the largest single star systems in the universe and are built by the collisions of many smaller galaxies.