Lexell’s Comet
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A really close encounter with a comet
Comets
For astronomers, though, a comet's beauty is not just in its appearance, but in its content: A comet is an
Remnants from the Beginning
Yet many remained, and are still with us today: a small planet (and maybe more than one), icy planetesimals that
What is the chance of Earth being hit by a comet or asteroid?
Not much in our lifetimes — perhaps 1 in 10,000 — but over thousands or millions of years, major impacts
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Did an asteroid really kill the dinosaurs?
The truth behind the demise of the dinosaurs may never be fully resolved, but a growing body of evidence has
How do I report seeing unusual objects in the sky?
It depends on what exactly you think you see. If you believe you have discovered a new member of a
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How big is the solar system?
The farthest known object orbiting our Sun is a ball of ice and rock unofficially called FarFarOut, which lies about