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Two asteroids pass by Earth Wednesday
An asteroid designated 2010 RF12 is expected to pass within approximately 49,000 miles of Earth at 5:12 p.m. EDT. Another asteroid, 2010 RX30, passed within approximately 154,000 miles overnight. Neither is a threat to Earth.
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Fundamental constant might change across space
Research results currently under peer review imply that the fine-structure constant, which characterizes the strength of the electromagnetic force, might have different values depending on which direction scientists are looking in the sky.
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Missing piece inspires new look at Mars puzzle
New experiments suggest that chlorine compounds from NASA's Viking landers then thought to be contaminants from cleaning fluids might indeed have contained carbon-based chemicals, the building blocks of life.
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Observing Lists
