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Free online courses in astronomy are offered by real schools. Learn which astronomy courses are available, what topics they cover and which ones lead to real college credit. Free online courses in astronomy are generally available as non-credit options. These courses don't require registration, and students can learn through audio and video lectures, text lectures, podcasts and downloads. Some of these courses include lecture notes or exams.
October 14th, 2008
By David J. Parker Citizen Kane . Casablanca . Gone With the Wind .
Oct. 19, 2011 — Two researchers from Observatoire Astronomique de Strasbourg have revealed for the first time the existence of a new signature of the birth of the first stars in our galaxy, the Milky Way. More than 12 billion years ago, the intense ultraviolet light from these stars dispersed the gas of our Galaxy's nearest companions, virtually putting a halt to their ability to form stars and consigning them to a dim future. Now Pierre Ocvirk and Dominique Aubert, members of the Light in the Dark Ages of the Universe (LIDAU) collaboration, have explained why some galaxies were killed off, while stars continued to form in more distant objects.
A month or two back, we posted our list of 30 amazing apps under 2MB . We thought it was a pretty fun concept, and apparently you guys agreed, because we got some great feedback, and some excellent suggestions. Our first list was far from complete, of course, so we decided to do some more investigating, and found 20 more great apps. They're all free, all easy to download, and all great at what they do.
New York The development of New York city in four easy pictures, for your viewing pleasure. Notice the significant jump in the height of the buildings by 1932?
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By Bill Knell People have believed in the possibility of a Hollow Earth for well over a century. Now, some say there also may be a Hollow Mars. The Hollow Earth stories began with a theory proposed by Edmund Halley in 1692.
There is an incredible metal that shatters like glass, melts in a human hand, attacks other metals but is non-toxic to humans, and acts like an alien life form when exposed to sulfuric acid and dichromate solution. It sounds too amazing to be true, but gallium is an absolutely real chemical element that’s found in some of the gadgets we use every day. But perhaps more interestingly, there are a ton of insane experiments scientists like to do with gallium. Thanks to its odd properties and behavior, gallium can do some pretty strange things in the lab. The above video shows what happens when gallium “attacks” aluminum. The “gallium beating heart” experiment is a popular one that shows how gallium can act like a living thing when submerged in sulfuric acid and a dichromate solution.
If you are an elitist foodie, I don't know what to tell you other than to check your 'tude at the door.
Edited by Maniac, Eric, Maluniu, Dave Crosby and 142 others Deactivating your Facebook account will temporarily hide your information, but deletion is permanent. Here's how to completely remove your Facebook account. Steps Deactivation 1 Try a temporary deactivation .
By Josh Cohen ORLANDO -- When you need a sports history refresher, glance over the evolution of team logos and suddenly a 15-minute conversation about classic games and performances with your buddies transforms into an endless one. I recently decided to browse over the timeline of NBA logos for each active franchise and astoundingly there are so many moments that popped in my head. For instance: When I gaze at the Utah Jazz logo that existed from 1996-2004, I can’t help but think of John Stockton and Karl Malone and their unforgettable NBA Finals clashes with the Chicago Bulls in 1997 and 1998. The Atlanta Hawks emblem from 1972-1995 definitely reminds me of the days of Dominique Wilkins, while the Detroit Pistons symbol from 1979-1996 undoubtedly prompts me to think of Isiah Thomas and the Bad Boys of the late 1980’s. It’s also astonishing the transformations that certain teams have made over the years to their image.
NASA and the Pentagon have been investigating space plane technology for decades, but the space shuttle is the only one in actual operation. The efforts left a legacy of unique aircraft that generated the data used by aerospace engineers to create the X-37B. Advocates hope the current Air Force program will pave the way for future concepts. 1960s X-20 Dyna-Soar Agency: USAF Type: Manned; experimental prototype Purpose: It was to be the first spacecraft to launch into space on a rocket and glide to land.
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World's Tallest Buildings 2015 These are the potential tallest skyscrapers of the world for 2015 Buildings which are presently proposed and under-construction are included in this diagram, along with existing buildings, if they are expected to be complete by 2015. Buildings are ordered by official height. This ordering method deals only with a building's roof height or spire height, whichever is greater, and doesn't take antenna heights into consideration. This method makes the Petronas Towers appear taller than the Sears Tower.