Physicists dropped objects on a satellite for two years to test Galileo's theory of falling objects.
In 2006 a star exploded 50 billion times brighter than our sun. New research suggests it wasn't one star, but two.
Why isn't there an endless variety of planets in the universe? An astrophysicist explains why planets only come in two flavors.
Anthropologist reveals a potentially big flaw in the Search for Extraterrestrial Intelligence (SETI).
There's a faint gamma-ray background in the universe, and scientists now think it could be caused by dark matter.
Scientists are searching for a ghostly neutrino particle that acts as its own antiparticle. If they find it, the discovery could resolve a cosmic conundrum: Why does matter exist at all?
The great distances covered by visiting "aliens" may be ones of time rather than space, a recent book argues.
The spectacular solar storms that paint the polar skies in beautiful greens and pinks have a darker side
The black hole at the center of the Milky Way may be warping and combining binary stars into a strange new kind of object, according to a new study.
String theory is a powerful idea, unfinished and untested, but one that has persisted for decades despite inauspicious beginnings.
Will the first woman to travel to the moon be the winner of a billionaire's "girlfriend contest"? We really hope not.
Excluding Mercury, this newly discovered asteroid has the smallest known aphelion distance in our entire solar system.
Researchers claim to have found serious fault with the existence of dark energy, but not everyone is buying into it.
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