Dean W. Armstrong

This is great; I've been holding off on sharing this because I felt like it was too special to share widely. But here's the deal--t...

I'm going to be honest: I can't stand anyone running cloud video footage in reverse. This drives me crazy; whether it's my phys...

Regarding that SDO video, a friend points out another video of the same event: http://www.spasmsofaccommodation.com/2010/02/sonic-boom-meets...

Sun Dogs are bright refractions of the Sun coming from horizontal ice crystals in the atmosphere. The ice crystals are usually oriented ho...

Color me surprised: I did not believe, when this object was first reported, and further debate on the Minor Planet Mailing List, that this w...

The bright orange "star" next to the Full Moon tonight and Friday is the planet Mars, which happens to be closest to Earth tonight...

A joule thief circuit lit from a 0.5V AAA battery. Click to enlarge. A Joule thief is a simple circuit that acts as a DC to DC booster, ra...

Las Vegas received more rain last week, 1.69 inches, than it did in all of 2009, when it received 1.59 inches. The "average" is a...

Patrick Wiggins makes a cool animation of an object passing by the Earth last week: http://users.wirelessbeehive.com/~paw/temp/2010AL30.2.GI...

If you are curious, the resistance of a 300W type J halogen bulb, the ones you would find in those halogen torchiere lamps, is 3.3 ohms when...

Happy Winter Solstice. From http://buscam.uchicago.edu/ taken on 11:54AM (a few minutes past the solstice time) (on campus only) Chicago is...

The saturnian satellite Tethys, imaged on October 14th, 2009. From the viewpoint of Cassini, the Sun was nearly directly behind the spacecr...

Cosmic Variance has a rumor about a supposed dark matter detection at the CDMS .

I am sure you've already seen this image from Mars of the swirly traces of dust devils removing the light dust from the darker surface. ...

Spaceweather has a photo Some video