May 9, 2011
Milky Way Should Have Much More Companionship
Our understanding of dark matter says the Milky Way should have many times more than its dozen or so small satellite galaxies. John Matson reports
Cosmology
Space & PhysicsMay 6, 2011
WIMP Wars: Astronomers and Physicists Remain Skeptical of Long-Standing Dark Matter Claim
An Italian research group has for years trumpeted a cyclical ebb and flow in particulate activity that the researchers ascribe to dark matter. But support for the claim has been hard to come by
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The SciencesMay 4, 2011
Garrett Lisi Responds to Criticism of his Proposed Unified Theory of Physics
May 2, 2011
Comet Bops Past Neptune Cleanly
Comet Hale-Bopp has been spotted beyond the orbit of Neptune, far enough from the sun to be without its dirty tail. John Matson reports
Space & PhysicsMay 1, 2011
The Lost Galaxies
By the latest estimate, the observable universe contains 200 billion galaxies. Astronomers wonder: Why so few?
EnvironmentMay 1, 2011
Recommended: The Fate of Greenland
Books and recommendations from Scientific American
Space & PhysicsApril 24, 2011
Budget crunch mothballs telescopes built to search for alien signals
Space & PhysicsApril 14, 2011
Underground Xenon100 experiment closes in on dark matter's hiding place
April 13, 2011
Paul Davies: Physics Could Help Fight Cancer
At a science and tech policy discussion, cosmologist Paul Davies talked about being recruited by the National Cancer Institute to study metastasis. Steve Mirsky reports
The SciencesApril 7, 2011
U.S. Collider Offers Physicists a Glimpse of a Possible New Particle
The soon-to-be-retired Tevatron collider has uncovered an unexplained signal that could be a previously unknown particle
April 6, 2011
How Cosmic Inflation Creates an Infinity of Universes [Video]
Space & PhysicsApril 1, 2011
The Inflation Debate
Is the theory at the heart of modern cosmology deeply flawed?