Register for an account


Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.


Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.

The Sciences

... and a real meteor over Georgia

Bad AstronomyBy Phil PlaitSeptember 1, 2011 6:51 PM


Sign up for our email newsletter for the latest science news

While the object in Peruvian skies may not have been a meteor, this thingcertainly was:

That was a fireball -- an extremely bright meteor -- that blew in over Atlanta, Georgia on August 28. The video is from the webcam at the Tellus Museum of Science in Georgia, part of the All Sky Fireball Network

(I wrote about them recently when this same camera caught the space station passing overhead

, in fact). The other streak you can see moving is an internal reflection in the camera, I believe, which shows you just how bright this fireball was. Since there are four cameras in the network, they could triangulate on the meteor, getting its height off the ground. Coupled with its apparent speed, that tells them it was screaming in at more than 83,000 kph (52,000 mph)! Given how bright it was, I suspect it was probably about the size of a grapefruit or so. Funny how something that small can make such a bright streak, but then speed is the key here. The brightness of a meteor depends on how much energy it can deposit in the atmosphere, and that is determined largely by its kinetic energy. That, in turn, depends on its mass and its velocity... and these things are moving far, far faster than a rifle bullet. The Tellus webcam caught other meteors that night too, which you can see here

. They're getting lots of information about the debris that hits us. And since about 100 tons of material enters Earth's atmosphere every day, there are plenty of interesting things to discover!

Related posts: - Shooting satellites, old and new - New meteor showers points to a future close encounter - How high is space? - Mesmerizing Perseid timelapse video

3 Free Articles Left

Want it all? Get unlimited access when you subscribe.


Already a subscriber? Register or Log In

Want unlimited access?

Subscribe today and save 70%


Already a subscriber? Register or Log In