Space & PhysicsJuly 1, 2009
Astronomers Size Up a Candidate for Midsize Black Hole
An object hundreds or thousands of times the mass of the sun would represent an elusive class of black hole
Relativity
The SciencesMarch 1, 2009
Was Einstein Wrong?: A Quantum Threat to Special Relativity
Entanglement, like many quantum effects, violates some of our deepest intuitions about the world. It may also undermine Einstein's special theory of relativity
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Space & PhysicsDecember 19, 2008
Beyond the Shadow of a Doubt? Dark Energy Independently Confirmed
The gravitationally repulsive presence, thought to make up most of the universe, shows its effect on the development of galaxy clusters
Space & PhysicsDecember 11, 2008
Closing In on the Milky Way's Central Black Hole
New studies track the motion of stars to pin down what holds sway at the heart of our galaxy
The SciencesMarch 6, 2008
Did Researchers Cook Data from the First Test of General Relativity?
Rumors of data mishandling in an historic eclipse study don't gibe
The SciencesMay 1, 2007
Can Molecules Hang Glide on Gravity?
Proposed effect, to slow the fall of a rapidly vibrating molecule, faces skepticism
The SciencesMarch 17, 2003
How does relativity theory resolve the Twin Paradox?
The SciencesJune 24, 2002
Peering Over Einstein's Shoulders
Seeking still more complete descriptions of the workings of spacetime, scientists are testing the boundaries of the special theory of relativity
The SciencesDecember 13, 1999
Recent articles in Scientific American have talked about traveling faster than light. But I always thought that Einstein's theory of relativity forbade that. What gives?