Earth Day from Space: Satellite Snaps Far-Out Photo (Image)
A U.S. satellite has captured the ultimate Earth Day view from space, showing the entire planet in a stunning group shot of humanity. The photo, taken today (April 22) to mark Earth Day, was captured by the GOES-East satellite at 7:45 a.m. EDT (1145 GMT)
'What Is Relativity?' (2014): Book Excerpt
Many people with a basic knowledge of physics know that Einstein developed the theory of relativity, yet few people actually understand what it means. But author and astrophysicist Jeffrey Bennett relativity should be something anyone can understand.
What Is Relativity? New Book Offers Simple Explanation
Why can't anything travel faster than the speed of light? Do black holes really suck? And why is the universe expanding? These are just a few of the questions author and astrophysicist Jeffrey Bennett answers in his new book, "What is Relativity?"