Comet Interceptor Could Be Our First Chance to Study an Interstellar Object
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Sometime in 2029, the European Space Agency is scheduled to launch its Comet Interceptor Mission.The Interceptor will wait for a long-period comet to arrive in the inner Solar System then set off on a trajectory to rendezvous with it. These objects are ancient and primordial, carrying material largely unaltered by time that holds clues to how the Solar System formed.
A new white paper shows how the Comet Interceptor could also be used to rendezvous with an Interstellar Object (ISO) like comet 3l/ATLAS. its titled “Intercepting Interstellar Objects,” and it’s been submitted to the UK Space Frontiers 2035 prioritisation exercise. The lead author is Colin Snodgrass from the Institute for Astronomy at the University of Edinburgh.
The first attempt to visit a comet with a spacecraft was in september in 1985, when NASA’s International Cometary Explorer (ICE) passed through the tail of comet 21P/Giacobini-Zinner. It didn’t carry any cameras,so ther are no pictures. Other missions followed, including another 1985 mission to Halley’s Comet. In 1999, NASA’s Stardust mission became the first to return a sample from a comet, delivering dust grains to Earth in 2006. Then there was NASA’s Deep impact mission to comet Tempel 1, and the ESA’s Rosetta mission to 67P/Churyumov-Gerasimenko.
This well-known gif shows dust and cosmic rays on 67P/Churyumov-Gerasimenko’s surface.
[GIF of dust and cosmic rays on 67P/Churyumov-Gerasimenko’s surface]
The ESA’s Comet Interceptor mission is different from all of those in one critical way.It will be launched before its target is known and will be parked in space to wait. This mission architecture makes it suitable for visiting an ISO, as there’s very little lead time to prepare for these objects. They arrive in the inner solar System without much notice and leave without staying for long.
“Comet Interceptor will wait in space until a suitable long period comet is discovered, allowing rapid response to perform a fast flyby of an object that will be in the inner Solar System for only a few years; an enhanced version of this concept could realistically provide the first in situ inquiry of a visitor from another star system,” the authors write.
The study of exoplanets has shown us that in some ways our Solar system is an outlier. the most common type of exoplanet, sub-Neptunes, aren’t represented in our Solar System. Other systems contain massive gas giants called hot Jupiters that orbit extremely close to their stars, while our Jupiter is much further away.Answers to why our system is so different might potentially be in ISOs.
“The next step beyond the detailed investigation of a relatively pristine remnant from our own Solar System’s protoplanetary disc will be to compare this with a body that formed elsewhere, to investigate the commonalities and differences between the planet formation process in different places and times in the galaxy,” the authors write.
[Image of an illustration of the ESA’s Comet interceptor with its two smaller probes attached. Image Credit: By ESA,CC BY-SA IGO 3.0, CC BY-]
The Vera Rubin Observatory and the Hunt for Interstellar comets: A Potential Key to Understanding Life Beyond Earth
The Vera C. Rubin observatory, currently under construction in Chile, is poised to revolutionize our understanding of the cosmos with its enterprising Legacy Survey of Space and Time (LSST). Beyond mapping the universe, a key goal of the LSST is to identify interstellar objects (ISOs) – comets or asteroids originating from outside our solar system. Detecting and perhaps studying these visitors could offer an unprecedented prospect to learn about the building blocks of life elsewhere in the Milky Way, and may represent humanity’s best chance of sampling material from another star system.
What are Interstellar Objects and Why are They Crucial?
Interstellar objects are celestial bodies that have been ejected from another star system and are currently traveling through our own. The first confirmed ISO, ‘Oumuamua, was discovered in 2017, followed by the interstellar comet 2I/Borisov in 2019. These discoveries demonstrated that such objects are not rare, and that our solar system is regularly visited by material from other stars. https://www.nasa.gov/feature/jpl/interstellar-objects-faq
The significance of studying ISOs lies in their potential to reveal clues about the formation and composition of planetary systems around other stars. unlike comets and asteroids native to our solar system, which have been altered by billions of years of evolution within our sun’s influence, ISOs represent pristine material directly from another system. Analyzing their composition could provide insights into the conditions under which other planets formed and whether those conditions were conducive to life.
The Rubin Observatory’s Role in ISO Revelation
The Rubin Observatory’s LSST is uniquely equipped to detect ISOs. Its wide-field survey will repeatedly scan the entire visible sky, allowing it to identify objects moving differently than those within our solar system. Scientists estimate the observatory will detect at least 10 ISOs, but the actual number could be substantially higher. https://www.lsst.org/
The data collected by the Rubin Observatory will be crucial for determining the population size of ISOs and estimating how long we might have to wait to find one that is reachable by a spacecraft. As the original text notes, this data is “a necessary step to make a convincing case for a mission” to intercept and study an interstellar object up close.
The Potential for Discovering the Building Blocks of Life
The study of comets within our solar system has already yielded exciting discoveries. The Rosetta mission, such as, found the amino acid glycine – a fundamental building block of proteins – on comet 67P/Churyumov-Gerasimenko. It also detected other complex organic molecules and phosphorus, a key component of DNA. https://www.esa.int/Science_Exploration/Space_Science/Rosetta
These findings suggest that the ingredients for life may be widespread throughout the universe and that life could potentially originate on any suitable world. Imagine the implications of finding similar, or even more complex, organic molecules on a comet originating from another star system.Such a discovery would strongly suggest that the chemical precursors to life are not unique to our solar system, bolstering the possibility of life elsewhere in the milky Way.
Why Interstellar Comets May Be Our Best Hope for Interstellar Sampling
Given the immense distances between stars, interstellar travel for humans remains a distant prospect. However, ISOs offer a unique opportunity to bring material from another star system to us. A dedicated mission to intercept and sample an interstellar comet – often referred to as a CI-type mission (Comet interceptor) – is considered a high-priority goal by many scientists. https://www.esa.int/Science_Exploration/Space_Science/Comet_Interceptor
The European Space Agency (ESA) is already developing Comet Interceptor, a mission designed to study a long-period comet or, if possible, an interstellar object. Scheduled for launch in 2029, Comet Interceptor will wait in space for a suitable target to approach, offering a unique opportunity to study a pristine comet from the outer solar system or beyond.
Key Takeaways:
* The Vera C. Rubin Observatory’s LSST is expected to significantly increase the number of known interstellar objects.
* ISOs offer a unique window into the composition of planetary systems around other stars.
* Discovering organic molecules on an ISO would strengthen the case for the widespread distribution of the building blocks of life.
* A mission to intercept and