Featured series 
Tag: Abraham Avi Loeb
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Nation & World
Two exiled stars are leaving our galaxy forever
TV reality show contestants aren’t the only ones under threat of exile. Astronomers using the MMT Observatory in Arizona have discovered two stars exiled from the Milky Way galaxy. Those…
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Nation & World
CfA researchers discover black holes aren’t so black
Common wisdom holds that we can never see a black hole because nothing can escape it – not even light. Fortunately, black holes aren’t completely black. As gas is pulled…
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Nation & World
Black holes aren’t so black
As gas is pulled into a black hole by its strong gravitational force, the gas heats up and radiates. That radiation can be used to illuminate the black hole and…
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Nation & World
Ferreting out the first stars
The first stars are so distant and formed so long ago that they are invisible to our best telescopes. Until they explode. Hypernovas (more powerful cousins of supernovas) and their…
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Nation & World
Taking a CAT scan of the early universe
Reporting in the Nov. 11, 2004, issue of Nature, astrophysicists J. Stuart B. Wyithe (University of Melbourne) and Abraham Loeb (Harvard-Smithsonian Center for Astrophysics) have calculated the size of cosmic…
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Nation & World
Lifeless suns dominated early universe
The very first generation of stars were not at all like our Sun. They were white-hot, massive stars that were very short-lived. Burning for only a few million years, they…
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Nation & World
First Milky Ways found at edge of universe
One key question that has puzzled astronomers for decades is: When did the first stars and galaxies form after the Big Bang occurred? The answer — very quickly! Astronomers Rennan…
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Nation & World
Neither Rome nor universe built in a day
Theoretical astrophysicists Stuart B. Wyithe and Abraham Loeb at the Harvard-Smithsonian Center for Astrophysics (CfA) have explained a paradox that has troubled scientists for years. Observations seem to show that…
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Nation & World
Looking toward the end
Among astronomers there is almost a consensus that universal expansion will go on forever, with galaxies and clusters of galaxies moving away from each other so fast that gravity cannot…
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Nation & World
Gamma rays may be left over from cosmic construction project
The origin of the diffuse and pervasive background of gamma-ray radiation that exists over the universe has been one of the great unsolved mysteries in cosmology. Even the known population…