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Explanation: What star created this huge expanding puffball? Featured here is the first expansion movie ever created for Tycho's supernova remnant, the result of a stellar explosion first recorded over 400 years ago by the famous astronomer Tycho Brahe. The 2-second video is a time-lapse composite of X-ray images taken by the orbiting Chandra X-ray Observatory between the years 2000 and 2015, added to a stock optical frame. The expanding gas cloud is extremely hot, while slightly different expansion speeds have given the cloud a puffy appearance. Although the star that created SN 1572, is likely completely gone, a star...

Explanation: Tycho crater's central peak complex casts a long, dark shadow near local sunrise in this spectacular lunarscape. The dramatic oblique view was recorded on June 10, 2011 by the Lunar Reconnaissance Orbiter. Shown in amazing detail, boulder strewn slopes and jagged shadows appear in the highest resolution version at 1.5 meters per pixel. The rugged complex is about 15 kilometers wide, formed in uplift by the giant impact that created the well-known ray crater 100 million years ago. The summit of its central peak reaches 2 kilometers above the Tycho crater floor.

It is a well known fact that there are scores of computer professionals who have been laid off and are out of work in this country. Those positions include software engineers, network engineers, and electrical engineers. Those who have lost their jobs in the past 24 months know what I am talking about. We all know WHY we've been laid off. It is because indentured servants from other lands have overrun our country with the help of Congress due to the false premise of a labor shortage by IT industry lobbyists. Here we have an opportunity to "layoff" those who...

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 September 12 X-Rays From Tycho's Supernova Remnant Credit: SAO, CXC, NASA Explanation: In 1572, Danish astronomer Tycho Brahe recorded the sudden appearance of a bright new star in the constellation Cassiopeia. The new star faded from view over a period of months and is believed to have been a supernova, one of the last stellar explosions seen in our Milky Way galaxy. Now known as Tycho's Supernova...