How was it proved that gravitation was a function of mass? [more inside]
posted by Lorc on Jul 6, 2009 - 10 answers

What textbook can I use to learn General Relativity, including the associated math? [more inside]
posted by DU on Jul 6, 2009 - 22 answers

References to Bose Einstein Condensates in popular media [more inside]
posted by Lesium on Jun 1, 2009 - 4 answers

Anyone know how to get "mad scientist hair?" [more inside]
posted by BrianBoyko on May 1, 2008 - 23 answers

How does Einstein prove nothing can go faster than the speed of light and that Atoms exist? [more inside]
posted by complience on Feb 14, 2008 - 20 answers

What did Einstein actually contribute to the modern world? With some scientists, you could say - he made the lightbulb, the other would be - without his help, the computer would not be possible, yet another - he made the first prototype of the airplane. Well, what did Einstein actually do? [more inside]
posted by markovich on Feb 14, 2007 - 32 answers

Time dilation and relative speed. If the speed we travel is relative to the thing we're travelling away from, then how does the universe know which of the two things is actually moving? (so time dilation can occur) Is there a known universal "zero-speed"? If so, at what speed is the earth moving, and would it make a difference to the time dilation depending on the direction a spaceship moved away from the earth?
posted by seanyboy on Jul 13, 2004 - 17 answers

trying to get my head around special relativity filter: Can someone explain to me, in terms as devoid of mathematical formulae as possible, how something traveling less than the speed of light cannot be accelerated to the speed of light?
posted by xmutex on Jul 6, 2004 - 17 answers