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Can we ship a spacecraft to intercept interstellar object 3I/ATLAS?

August 5, 2025
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Can we ship a spacecraft to intercept interstellar object 3I/ATLAS?
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NASA’s Juno spacecraft may very well be despatched to intercept the interstellar object

NASA/JPL-Caltech

An interstellar object at present hurtling by means of our photo voltaic system will loop across the solar and disappear again into the distant depths of the cosmos inside months. Astronomers will be capable of seize pictures as comet 3I/ATLAS traverses our area of area, however do we now have any probability of intercepting this object – solely the third of its variety ever noticed – to study extra about it?

Scientists world wide are exploring numerous choices to just do that, together with proposals to reroute NASA and European Area Company (ESA) missions already in area and repurpose shelved spacecraft tasks for a hurried launch. However with the comet shifting at 60 kilometres per second and so little time to organize, it received’t be simple.

One of many proposed plans is from Avi Loeb at Harvard College, who controversially urged that the interstellar object ‘Oumuamua may very well be an alien spacecraft and has made similar claims about 3I/ATLAS. Loeb and his colleagues have launched a paper, which has not been peer-reviewed, proposing that NASA’s Juno spacecraft may very well be boosted out of its present orbit round Jupiter to satisfy 3I/ATLAS on 14 March subsequent 12 months.

The thought isn’t with out its issues. Mark Burchell on the College of Kent, UK, factors out that Juno is outdated – and displaying its age. The craft launched in 2011 and was initially meant to finish its mission by crashing into Jupiter’s floor in 2021, though that was later postponed to September this 12 months. It has already encountered two technical glitches this year, each of which have been rectified by engineers.

“Its present orbit permits it to view Jupiter up shut, and its visits to Io [a moon of Jupiter] in 2023 [and] 2024 uncovered it to plenty of radiation. So it’s no shock it’s now displaying anomalies in efficiency that want rebooting,” says Burchell. “Might or not it’s re-tasked? In principle, if it may be carried out, and the devices work, then there’s novel information there.”

In a post on X, Jason Wright at Pennsylvania State College additionally expressed scepticism concerning the thought, stating that the craft is low on gasoline and has points with its engine.

One other probe already in area that might get a more in-depth have a look at 3I/ATLAS is the ESA’s Jupiter Icy Moons Explorer (JUICE), which is at present on its method in direction of the planet to check three of its moons. Luca Conversi on the ESA says the company is trying into this chance. “We’re conscious of this treasured alternative and are at present exploring the technical feasibility. I can not add an excessive amount of in the mean time, sadly,” says Conversi.

However whereas JUICE would have a more in-depth view than Earth, it received’t be capable of change course in direction of 3I/ATLAS. “I’m undecided it’s possible to ship it to the comet: sadly astro-dynamics is extra difficult than what we see in sci-fi films, and it’s not simple to alter the course of spacecraft,” says Conversi.

There are a number of spacecraft at present in orbit round Mars which are approaching the tip of their lifespans, such because the Mars Reconnaissance Orbiter and Mars Odyssey, which could have an opportunity of a flyby previous 3I/ATLAS, according to work carried out by Atsuhiro Yaginuma at Michigan State College and his colleagues. The benefit of this method is that the comet will move a lot nearer to Mars than Earth, however it isn’t but clear if any of those craft have sufficient gasoline for the journey.

The ESA is engaged on one other mission that ought to give us a greater probability of getting near an interstellar object sooner or later. The Comet Interceptor spacecraft, as a consequence of launch in 2029, will loiter at a steady level between Earth and the solar, ready for the invention of a comet or interstellar object that it could actually race to satisfy and survey. The mission is very uncommon as a result of on the time of launch, scientists will nonetheless don’t know what its meant goal is, or when that concentrate on will seem.

Colin Snodgrass on the College of Edinburgh, UK, the deputy lead for Comet Interceptor, says even this mission would “want a bit extra oomph” to catch an object shifting as quick as 3I/ATLAS. For these speedy guests, probably the most lifelike method is to have a big mission with much more gasoline and fewer sensors. “When you actually simply need to have one thing that goes quick and simply will get a glance, then you definitely strip it proper right down to the minimal helpful payload and put all of the mass into gasoline – and then you definitely’d have a shot,” he says.

One other concept that may very well be helpful sooner or later entails placing a small satellite tv for pc into a big orbit as soon as a month. “You’d find yourself with this stuff spaced throughout Earth orbit,” says Snodgrass. “And so in any given month, one in every of them can be coming again in direction of Earth after which might use gravity help to go off someplace attention-grabbing.”

Astronomy tasks just like the Legacy Survey of Area and Time will quickly give us a greater understanding of the variety of these objects that enter our photo voltaic system, in addition to earlier warnings of their arrival. “It might undoubtedly make a distinction when it’s going this quick. Even in case you had a 12 months [of] warning as an alternative of some months’ warning earlier than perihelion, that may make an enormous distinction,” says Snodgrass.

New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

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