Comets TOP STORY
Landslides, Avalanches May Be Key to Long-Term Comet Activity 
© ESA Copernicus
Comet 67P
The release of gases through sublimation is the defining process of comets.
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Comets TOP STORIES
TESS Catches a Comet Before Starting Science
© MIT/NASA
C/2018 N1
Before NASA's Transiting Exoplanet Survey Satellite (TESS) started science operations on July 25, 2018, the planet hunter sent back a stunning sequence of serendipitous images showing the motion of a comet.
Molecular Oxygen in Comet 67P's Atmosphere Was Not Created On Its Surface
Scientists have found that molecular oxygen around comet 67P is not produced on its surface, as some suggested, but may be from its body.
Hubble Sees 'Oumuamua Getting a Boost, Like a Comet
'Oumuamua -- the first interstellar object discovered within our solar system -- has been the subject of intense scrutiny since its discovery in October 2017.
′Oumuamua Was Propelled By Cometary Jets
Observations from Hubble and ground-based observatories have confirmed ′Oumuamua got an unexpected boost in speed and shift in trajectory as it passed through the inner solar system last year.
Interstellar Asteroid 'Oumuamua Is Actually A Comet
An object from another star system that made a brief appearance in our skies guised as an asteroid turns out to be a tiny interstellar comet.
Rosetta Unravels Formation of Comet's Sunrise Jets
The atmosphere of Rosetta's comet 67P/Churyumov-Gerasimenko is far from homogeneous.
Comet 96P Spotted by ESA, NASA Satellites
Comet 96P entered the bottom of STEREO's view and crossed it diagonally before leaving on Oct. 28.
Rosetta Reveals Missing Link In Understanding of Planet Formation
The missing link in our understanding of planet formation has been revealed by the first ever spacecraft to orbit and land on a comet, say German scientists.
Planets Form From Comets
Narrow dense rings of comets are coming together to form planets on the outskirts of at least three distant solar systems, astronomers have found in data from a pair of NASA telescopes.
Hubble Observes the Farthest Active Inbound Comet Yet Seen
NASA's Hubble Space Telescope has photographed the farthest active inbound comet ever seen, at a whopping distance of 1.5 billion miles from the Sun (beyond Saturn's orbit).
Large, Distant Comets More Common Than Previously Thought
Comets that take more than 200 years to make one revolution around the Sun are notoriously difficult to study.
Strange Comet Challenging Researchers
Scientists pursue research through observation, experimentation and modeling. They strive for all of these pieces to fit together, but sometimes finding the unexpected is even more exciting.
Explaining An Oxygen Mystery on Comets
A Caltech chemical engineer who normally develops new ways to fabricate microprocessors in computers has figured out how to explain a nagging mystery in space -- why comets expel oxygen gas, the same gas we humans breathe.
Watching Landslides On A Comet
Sudden and short-lived outbursts were observed frequently during Rosetta's two-year mission at Comet 67P/Churyumov-Gerasimenko.
NASA Study Hints at Possible Change in Water 'Fingerprint' of Comet
A trip past the sun may have selectively altered the production of one form of water in a comet - an effect not seen by astronomers before, a new NASA study suggests.
Arecibo Observatory Images Comet 45P/Honda-Mrkos-Pajdusakova
Though not visible to the naked eye or even with binoculars, the green-tailed Comet 45P/Honda-Mrkos-Pajdusakova (HMP) did not escape the gaze of the world-renowned Arecibo Observatory.
Comet Destruction Observed Around Another Star
Scientists using the NASA/ESA Hubble Space Telescope have observed, for the first time, a massive, comet-like object that has been ripped apart and scattered in the atmosphere of a white dwarf.
More top stories from September.
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Video: Rosetta Mission Comes to an End and Science Highlights
Rosetta's Comet Offered Brief and Powerful Summer Fireworks
Philae Comet Lander Faces Eternal Hibernation
Philae Lander: One Year On A Comet
Philae's Descent on Comet 67P/Churyumov-Gerasimenko: The Director's Cut
ESA: The Organic Comet 67P/Churyumov-Gerasimenko
Rosetta Reveals Surprises in Comet 67P's Coma
Video and Image: Rosetta Mission Results from Philae 14 November 2014
Video and Images: Rosetta Mission Philae Lander Media Briefing 13 November 2014
Artist's Impression of Exocomets Orbiting the Star Beta Pictoris
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