Comets TOP STORY

Planets Form From Comets

© STSCI

Mars Imaged by Hubble

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.


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Comets TOP STORIES

Hubble Observes the Farthest Active Inbound Comet Yet Seen

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C/2017 K2 (PANSTARRS) or "K2"

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

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

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

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

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

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

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

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.


Micro Spacecraft Investigates Cometary Water Mystery

Micro Spacecraft Investigates Cometary Water Mystery

In September 2015, a team of astronomers from the National Astronomical Observatory of Japan, University of Michigan, Kyoto Sangyo University, Rikkyo University and the University of Tokyo successfully observed the entire hydrogen coma of the comet 67P/Churyumov-Gerasimenko, using the LAICA telescope onboard the PROCYON spacecraft.


NEOWISE Discovers One, Maybe Two Comets

NEOWISE Discovers One, Maybe Two Comets

NASA's NEOWISE mission has recently discovered some celestial objects traveling through our neighborhood, including one on the blurry line between asteroid and comet. Another--definitely a comet--might be seen with binoculars through next week.


The Relationships Between Chemicals on Comets

The Relationships Between Chemicals on Comets

A new study has revealed similarities and relationships between certain types of chemicals found on 30 different comets, which vary widely in their overall composition compared to one another.


Rosetta Ends Its Mission By Slowly Crash Landing On A Comet

Rosetta Ends Its Mission By Slowly Crash Landing On A Comet

ESA's historic Rosetta mission has concluded as planned, with the controlled impact onto the comet it had been investigating for more than two years


Video: Rosetta Mission Comes to an End and Science Highlights

Video: Rosetta Mission Comes to an End and Science Highlights Video in Story

The Rosetta mission came to an end today with the orbiter purposefully "crash" landing (softly) on the Comet 67P/Churyumov-Gerasimenko just as the Philae lander had done previously.


Astronomers Capture Best View Ever of Disintegrating Comet

Astronomers Capture Best View Ever of Disintegrating Comet

Astronomers have captured the sharpest, most detailed observations of a comet breaking apart 67 million miles from Earth, using NASA's Hubble Space Telescope.


Rosetta's Comet Offered Brief and Powerful Summer Fireworks

Rosetta's Comet Offered Brief and Powerful Summer Fireworks Video in Story

Brief but powerful outbursts seen from Comet 67P/Churyumov-Gerasimenko during its most active period last year have been traced back to their origins on the surface.


Rosetta's Descent Towards Active Pits on Comet 67P

Rosetta's Descent Towards Active Pits on Comet 67P

Squeezing out unique scientific observations until the very end, Rosetta's thrilling mission will culminate with a descent on 30 September towards a region of active pits on the comet's 'head'.


Philae Lander Found on Comet 67P

Philae Lander Found on Comet 67P

Less than a month before the end of the mission, Rosetta's high-resolution camera has revealed the Philae lander wedged into a dark crack on Comet 67P/Churyumov-Gerasimenko.



More top stories from October.