Comets Archives

October 19, 2019October 19, 2019 by Matt Williams

Comets and Interstellar Objects Could be Exporting Earth Life Out into the Milky Way

An artist’s overview of the mission concept for the Comet Interceptor spacecraft, which will fly from the vicinity of Earth to rendezvous with a long-period comet or interstellar object inbound from the outer solar system. Credit: ESA

For over a century, proponents of Panspermia have argued that life is distributed throughout our galaxy by comets, asteroids, space dust, and planetoids. But in recent years, scientists have argued that this type of distribution may go beyond star systems and be intergalactic in scale. Some have even proposed intriguing new mechanisms for how this distribution could take place.

For instance, it is generally argued that meteorite and asteroid impacts are responsible for kicking up the material that would transport microbes to other planets. However, in a recent study, two Harvard astronomers examine the challenges that this would present and suggest another means – Earth-grazing objects that collect microbes from our atmosphere and then get flung into deep-space.

October 17, 2019October 17, 2019 by Evan Gough

Here’s the Picture We’ve Been Waiting for. Hubble’s Photo of Interstellar Comet 2I/Borisov

A Hubble image of comet 2I/Borisov speeding through our Solar System. Image Credit: NASA, ESA, and D. Jewitt (UCLA)

Leave it up to the good ole Hubble Space Telescope. The workhorse telescope has given us a photo of the new interstellar comet 2I/Borisov. Take that, fancy new telescopes.

October 4, 2019October 4, 2019 by Matt Williams

Astronomers Find Cyanide Gas in Interstellar Object 2I/Borisov, but Don’t Panic Like it’s 1910

When the mysterious object known as ‘Oumuamua passed Earth in October of 2017, astronomers rejoiced. In addition to being the first interstellar object detected in our Solar System, but its arrival opened our eyes to how often such events take place. Since asteroids and comets are believed to be material left over from the formation of a planetary system, it also presented an opportunity to study extrasolar systems.

Unfortunately, ‘Oumuamua left our Solar System before any such studies could be conducted. Luckily, the detection of comet C/2019 Q4 (Borisov) this summer provided renewed opportunities to study material left by outgassing. Using data gathered by the William Herschel Telescope (WHT), an international team of astronomers found that 2I/Borisov contains cyanide. But as Douglas Adams would famously say, “Don’t Panic!”

September 20, 2019September 20, 2019 by Evan Gough

Rosetta Saw Collapsing Cliffs and Other Changes on 67P During its Mission

An example of a boulder having moved across the surface of Comet 67P/Churyumov-Gerasimenko’s surface, captured in Rosetta’s OSIRIS imagery. The image was taken with the narrow-angle camera and shows the boulder in the lower third of the image. Image Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA (CC BY-SA 4.0);

It seems that comet 67P/Churyumov–Gerasimenko is not the stoic, unchanging Solar System traveller that it might seem to be. Scientists working through the vast warehouse of images from the Rosetta spacecraft have discovered there’s lots going on on 67P. Among the activity are collapsing cliffs and bouncing boulders.

September 17, 2019September 17, 2019 by Matt Williams

Could We Intercept Interstellar Comet C/2019 Q4 Borisov?

Artist's impression of Oumuamua leaving the Solar System. Credit: NASA

When ‘Oumuamua passed through our Solar System two years ago, it set off a flurry of excitement in the astronomical community. Here was the first-ever interstellar object that be observed by human trackers, and the mysteries surrounding its true nature and composition led to some pretty interesting theories. There were even some proposals for a rapid mission that would be able to rendezvous with it.

And now that a second interstellar object – C/2019 Q4 (Borisov) – has been detected traveling through the Solar System, similar proposals are being made. One of them comes from a group of scientists from the Initiative for Interstellar Studies (i4is) in the UK. In a recent study, they assess the technical feasibility of sending a mission to this interstellar comet using existing technology, and found that there were a few options!

September 14, 2019September 14, 2019 by Matt Williams

Images are Starting to Come in of the New Interstellar Comet

On August 30th, amateur astronomer Gennady Borisov spotted a comet of extrasolar origin passing through our Solar System. This is the second time in as many years that an interstellar object has been observed (the last being ‘Oumuamua 2.0 in 2017). Thanks to the Gemini Observatory, we now have pictures of this comet, making it the first object of its kind to be successfully imaged in multiple colors!

September 13, 2019September 14, 2019 by Matt Williams

Oumuamua 2.0? It Looks Like There’s a New Interstellar Object Passing Through the Solar System

Artist’s impression of the interstellar object, `Oumuamua, experiencing outgassing as it leaves our Solar System. Credit: ESA/Hubble, NASA, ESO, M. Kornmesser

In 2017, astronomers and the world were surprised to learn that an interstellar object (named ‘Oumuamua) passed by Earth on its way to the outer Solar System. After multiple surveys were conducted, scientists were left scratching their heads as to what this object was – which speculation ranging from it being a comet or an asteroid to comet fragment or even an extra-terrestrial solar sail!

But one of the greatest takeaways from that event was the discovery that such objects pass through our Solar System on a regular basis (and some stay). And as it turns out, astronomers with NASA, the ESA, and the International Scientific Optical Network (ISON) announced the detection of what could be a second interstellar object! Could this be ‘Oumuamua 2.0? And if so, what mysteries might it present?

August 15, 2019August 15, 2019 by Evan Gough

An Astrophotographer Noticed a Chunk of Ice Orbiting Comet 67P in Rosetta’s Photos

"Churymoon," comet 67P/Churymuov-Gerasimenko's tiny, icy companion. It was brought to light by Spanish astrophotographer Jacint Roger who was working with the archive of images from the ESA's Rosetta mission. Image Credit: ESA/Rosetta/MPS/OSIRIS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA/J. Roger (CC BY-SA 4.0)

The European Space Agency’s (ESA) Rosetta mission spent two years at the comet 67P/Churyumov-Gerasimenko. At the end of September 2016, its mission was ended when the spacecraft was sent on a collision course into the comet. During its time at comet 67P, it captured a vast amount of images.

The ESA made all those images freely available at their Rosetta website, and now an astro-photographer working with those images has found something interesting: a chunk of ice travelling through space with 67P.

June 29, 2019June 29, 2019 by Evan Gough

Meet the Comet Interceptor. It’ll Wait Patiently In Space for a Comet, Then Pounce On It

The ESA has announced a new mission to explore a comet. The Comet Interceptor mission will have a spacecraft wait in space until a pristine comet approaches the inner Solar System. Then it will make a bee line for it, and do some ground-breaking science.

April 17, 2019April 17, 2019 by Evan Gough

Astronomers Find a Chunk of a Comet Inside a Meteorite

A slice from the LaPaz 02342 meteorite which contains dust grains from an ancient comet. Image Credit: Carnegie Institution/Nittler et. al. 2019.

The early days of the Solar System are hard to piece together from our vantage point, billions of years after it happened. Now a team of scientists have found a tiny chunk of an ancient comet inside an ancient meteorite. They say it sheds light on the early days of the Solar System when planets were still forming.