Dean W. Armstrong

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

The Earth captured from the Rosetta spacecraft as it passed by Earth. . ESA. Taken on 11/12/2009. Click to enlarge. As seen on the Planet...

You can see the International Space Station in Chicago in the evening for the rest of the month. If schedules hold, you will also be able t...

One of the things I've always been interested in was radio; and part of that was scanning as much of the radio spectrum as possible to h...

The International Space Station on September 11th, 2009, as viewed from Chicago. Click to enlarge.

Click to enlarge. Image taken on April 22th, 2007 with Canon S300. Hue/Autolevels modified.

This image of Mercury was taken yesterday, September 29th, 2009. credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie ...

This circuit connected to my geiger counter uses on average 80uA-- that's 0.08mA. On a click, it will bump up to 0.1mA. On startup ju...

I've been having serial port problems with my geiger counter that has been running since December 1st, 2005, and so at the moment there...

See the International Space Shuttle and the Shuttle together in orbit here in Chicago: http://www.heavens-above.com/PassSummary.aspx?satid=2...