Reporting in the Astrophysical Journal, scientists write of a massive collision between two galaxy clusters. By studying the cosmic remnants of that smashup, they say leftover dark matter isn't behaving as current theory predicts. Astrophysicist Andisheh Mahdavi discusses this dark matter mystery.
Experts say health effects from the radiation released by last year's nuclear disaster will be minimal. But the lasting psychological trauma from the tsunami, including the loss of life and livelihoods, will be an ongoing struggle.
The huge solar storm that NASA detected hurtling toward Earth hit our planet at 5:42 a.m. ET Thursday. So far, there have been no reports of major power or communications disruptions. But it's not the last you'll hear about solar storms; the sun's activity won't peak until 2013.
The sun ejected two huge solar flares Tuesday, and NASA says that we here on Earth will likely be affected somewhat by the magnetic fields and ionized gas that are now shooting toward the planet. But the phenomena might also bring aurora light shows to residents of the northern United States
Scientists at the Food and Drug Administration are feeling more optimistic about the future of their agency than they were back in 2006, according to a survey just out from the Union of Concerned Scientists. But they still report concerns about outside pressures on the agency's decisions and policies.
The U.S. has been dependent on foreign oil for its energy needs for decades. Some analysts now say the country could become energy independent over the next decade. Still, exactly what "energy independence" means is in dispute.
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