Dean W. Armstrong

Oh man, this is great . The radar images from last week indicated the comet was dog-boned shaped but the close-ups from the former Deep Imp...

Phil Plait points out pits on the Moon ! Click to enlarge. Images via NASA/GSFC/Arizona State University/LROC

Click to enlarge to medium size. The link below goes to the really big image. Today's weather in Chicago as seen from above via the MOD...

http://www.heavens-above.com/PassSummary.aspx?satid=25544&lat=41.781312&lng=-87.605097&loc=Chicago&alt=0&tz=CST

Soichi Noguchi captures a poignant moment as the Shuttle leaves the International Space Station. Click to enlarge to a higher quality imag...

http://www.heavens-above.com/PassSummary.aspx?satid=25544&lat=41.781312&lng=-87.605097&loc=Chicago&alt=0&tz=CST 4 Mar ...

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...

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...

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

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. ...

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...

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

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

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

The Kepler mission is looking at this field of stars in Cygnus and Lyra . One of these stars will have an Earth-sized planet orbiting a sta...

If you are searching for ISS and Shuttle passes over Chicago, tonight's was the last one for a while. If you are an early morning perso...

Enceladus' north pole. Click to enlarge to awesome. via Planetary Society Blog .

The LRO imaged most of the Apollo landing site on the Moon. Things will get better as the orbital parameters are modified. There appears t...