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Hubble Observes Interstellar Comet 2I/Borisov

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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Interstellar Comet with a Familiar Look

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

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

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

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/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

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

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.