Comets

The scientists came to the conclusion after examining 'Oumuamua's trajectory.
The dwarf planet was reclassified once before in 2006.
Though both dark matter and dinosaurs are independently fascinating, you might reasonably assume that this unseen physical substance and this popular biological icon are entirely unrelated. And this might well be the case. But the Universe is by definition a single entity and in principle its components interact.
My childhood books on geology had dramatic drawings of volcanoes belching steam into the atmosphere of a prehistoric and still-sterile Earth, suggesting that our planet was born with a subcutaneous reserve of water, waiting to be lanced to the surface by accommodating eruptions. As a kid, that sure seemed reasonable. But it's not true.
For the study, the scientists used an icebox-like cryostat device dubbed Himalaya to simulate the conditions that a comet's
The study will be published in the Feb. 1 issue of the journal Terra Nova. Correction: A previous version of this article
It will be fun to see what turns up in the Rosetta and Philae images and data from Comet 67P/Churyumov-Gerasimenko! Astronomy is always full of surprises when you see something at high resolution for the first time.
Rosetta spacecraft's OSIRIS narrow-angle camera obtained this close-up detail of a smooth region on the "base" of the "body
I've always regarded asteroids as somewhat like dinosaurs: mildly interesting and faintly dangerous. But I'm now thinking that they might be a profitable real estate investment.
New research suggests a tantalizing hypothesis: that the dark matter in the Milky Way caused the mass extinction 65 million years ago that killed off the dinosaurs, as well as other mass extinctions, which seem to take place somewhat regularly, with a period of some 35 million years.
One submission even came from NASA's Jet Propulsion Laboratory to promote the contest to U.S. audiences, Scuka said. The
11 Must-See Skywatching Events in 2014 Best Telescopes for Beginners | Telescope Reviews & Buying Guide Photos of Halley's
Ice core data record evidence of a volcanic eruption in 536, but it almost certainly wasn't big enough to change the climate
Comet ISON is now two days away from a close encounter with the Sun, an encounter that it very well may not survive. On Thursday ISON will sweep around the Sun, clearing its roiling surface by as little as 800,000 miles. After Thanksgiving, one of three fates will have come to pass.
Copy the code below to embed this infographic on your site: As long as ISON survives on Nov. 28, early December should be
You don't need NASA to tell you how to cook an egg. Mac and cheese? You can handle that too. But when it comes to knowing
Joe Rao serves as an instructor and guest lecturer at New York's Hayden Planetarium. He writes about astronomy for Natural