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Universe's Lithium Problem A Bit Better

Studies of primitive stars suggest the universe has far too little of one form of lithium and far too much of another. But new work shows that the second problem might be nonexistent. > read more

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Comet ISON Approaches
The “comet of the century” was stuck at 16th magnitude when it hid out for the summer. Still, good prospects remain for December. > read more
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the top five:
Recent Articles
Cat’s Paw Nebula: Nearby Mini-Starburst?
This Week's Sky at a Glance
Universe's Lithium Problem A Bit Better
My Hour in the Stratosphere
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Comet ISON Approaches
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