Comets TOP STORY

Hubble Observes Interstellar Comet 2I/Borisov

© STSCI

Comet 2I/Borisov

On 12 October 2019, the NASA/ESA Hubble Space Telescope provided astronomers with their best look yet at an interstellar visitor -- Comet 2I/Borisov -- which is believed to have arrived here from another planetary system elsewhere in our galaxy.


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Comets TOP STORIES

Interstellar Comet with a Familiar Look

© Gemini Observatory

First-ever Interstellar Comet 2I/Borisov

For decades, astronomers have speculated that the space between stars may be populated by exosolar minor bodies -- comets and asteroids -- ejected from their home planetary systems.

Get Ready For More Interstellar Objects

Get Ready For More Interstellar Objects

Gregory Laughlin and Malena Rice weren't exactly surprised a few weeks ago when they learned that a second interstellar object had made its way into our solar system.


Collapsing Cliffs Bouncing Boulders om Comet 67P

Collapsing Cliffs Bouncing Boulders om Comet 67P

Scientists analysing the treasure trove of images taken by ESA's Rosetta mission have turned up more evidence for curious bouncing boulders and dramatic cliff collapses.


Migrating Scarps as a Significant Driver for Cometary Surface Evolution

Migrating Scarps as a Significant Driver for Cometary Surface Evolution

Rosetta observations of 67P/Churyumov-Gerasimenko (67P) reveal that most changes occur in the fallback-generated smooth terrains, vast deposits of granular material blanketing the comet's northern hemisphere.


Comet 67P/Churyumov-Gerasimenko Has A Tiny Moon -  A 'Churymoon'

Comet 67P/Churyumov-Gerasimenko Has A Tiny Moon - A 'Churymoon'

Comet 67P/C-G is a dusty object. As it neared its closest approach to the Sun in late July and August 2015, instruments on Rosetta recorded a huge amount of dust enshrouding the comet.


How The Shoemaker-Levy 9 Comet Impact On Jupiter Led to Planetary Defense

How The Shoemaker-Levy 9 Comet Impact On Jupiter Led to Planetary Defense

Twenty-five years ago, humanity first witnessed a collision between a comet and a planet.


Comet Inspires Chemistry for Making Breathable Oxygen on Mars

Comet Inspires Chemistry for Making Breathable Oxygen on Mars

Science fiction stories are chock full of terraforming schemes and oxygen generators for a very good reason -- we humans need molecular oxygen (O2) to breathe, and space is essentially devoid of it. Even on other planets with thick atmospheres, O2 is hard to come by.


Three Exocomets Discovered Around Beta Pictoris

Three Exocomets Discovered Around Beta Pictoris

Just about a year after the launch of the NASA mission TESS, the first three comets orbiting the nearby star Beta Pictoris outside our solar system were discovered in data from the space telescope.


Rosetta's Comet Sculpted by Stress

Rosetta's Comet Sculpted by Stress

Feeling stressed? You're not alone. ESA's Rosetta mission has revealed that geological stress arising from the shape of Comet 67P/Churyumov-Gerasimenko has been a key process in sculpting the comet's surface and interior following its formation.


A Close Look At Comet 46P/Wirtanen

A Close Look At Comet 46P/Wirtanen

As the brilliant comet 46P/Wirtanen streaked across the sky, NASA telescopes caught it on camera from multiple angles.


International Effort Studies Comet 29P and Finds Unusual Composition

International Effort Studies Comet 29P and Finds Unusual Composition

Evgenij Zubko of Far Eastern Federal University (FEFU) in collaboration with other international team members has developed a comprehensive model to explain the results of a photometric study of the Comet Schwassmann-Wachmann 1 (29P).


Landslides, Avalanches May Be Key to Long-Term Comet Activity

Landslides, Avalanches May Be Key to Long-Term Comet Activity

The release of gases through sublimation is the defining process of comets.


TESS Catches a Comet Before Starting Science

TESS Catches a Comet Before Starting Science

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

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

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

′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

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.



More top stories from October.