{"id":138813,"date":"2025-09-12T23:17:14","date_gmt":"2025-09-12T23:17:14","guid":{"rendered":"https:\/\/www.newsbeep.com\/au\/138813\/"},"modified":"2025-09-12T23:17:14","modified_gmt":"2025-09-12T23:17:14","slug":"the-space-mystery-of-the-year-why-is-this-interstellar-object-entering-our-solar-system","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/au\/138813\/","title":{"rendered":"The space mystery of the year: why is this interstellar object entering our Solar System?"},"content":{"rendered":"

Right now, an object from deep space is flying through our solar system\u2014and astronomers are scrambling to figure out what it is. Spotted just a few weeks ago, this visitor has already sparked surprises and raised big questions.<\/p>\n

Discovered in early July 2025, the object is on a rare, open-ended hyperbolic trajectory, racing along at around 220,000 kilometers per hour (about 137,000 mph). It didn\u2019t take long for astronomers to agree: this thing isn\u2019t from around here. That\u2019s why it\u2019s been named 3I\/Atlas\u2014\u201c3I\u201d meaning it\u2019s the third interstellar object<\/a> ever spotted near Earth, and \u201cAtlas\u201d after the system that detected it: the Asteroid Terrestrial-impact Last Alert System, designed to catch near-Earth objects before they get too close.<\/p>\n

Not to worry, though\u2014NASA has confirmed that 3I\/Atlas poses no threat. It won\u2019t get any closer than 270 million kilometers (about 168 million miles) from Earth. By late October, it\u2019ll reach its closest point to the Sun\u2014roughly 210 million kilometers away, just inside Mars\u2019s orbit.<\/p>\n

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Comet 3I\/Atlas at its discovery on July 1, 2025. \u00a9 Atlas, University of Hawaii, NASA<\/p>\n

A strange comet takes shape<\/p>\n

Because 3I\/Atlas will be out of view from Earth during much of October, astronomers quickly turned their best instruments on it. Early data confirmed its cometary nature. Images showed a reddish halo\u2014or coma\u2014likely caused by silicates loaded with organic material. The coma has grown as the object nears the Sun.<\/p>\n

Interestingly, even before its discovery, data suggested the comet\u2019s activity was driven by the sublimation of volatile ices other than water. Since then, spectroscopic analysis has revealed traces of water, as well as a few surprises: huge CO\u2082 emissions<\/a> stretching nearly 350,000 kilometers, plus signs of cyanide and nickel.<\/p>\n

The coma appears to extend toward the Sun\u2014not a classic tail, but more like a dust plume from the heated surface of the comet\u2019s nucleus. However, other observations show a faint, wide tail stretching away from the Sun\u2014typical for comets, but tricky to see from Earth since it\u2019s pointing in the opposite direction.<\/p>\n

NASA\u2019s recently launched SPHEREx mission, operating in the near-infrared, has captured valuable observations of the interstellar comet 3I\/ATLAS from August 7 to 15, 2025. <\/p>\n

Working in concert with the Webb and Hubble space telescopes, SPHEREx has contributed to unveiling the\u2026 pic.twitter.com\/Vv6Oa9XAIk<\/a><\/p>\n

\u2014 Erika \uea00 (@ExploreCosmos_) August 26, 2025<\/a> <\/p>\n

What we still don\u2019t know<\/p>\n

At first, scientists thought the comet\u2019s core might be huge\u201410 to 20 kilometers across. But later images from the Hubble Space Telescope<\/a> suggested a much smaller size, somewhere between 0.32 and 5.6 kilometers. Still, that coma is so reflective it could be throwing off estimates, making the comet look bigger than it actually is.<\/p>\n

A rare glimpse into distant worlds<\/p>\n

Studying interstellar objects like 3I\/Atlas gives astronomers a rare look into how planetary systems form outside our own. It\u2019s a chance to compare their building blocks with what we know about our own solar system\u2019s history.<\/p>\n

Researchers believe 3I\/Atlas came from the direction of the Sagittarius constellation, near the heart of the Milky Way. Based on its composition, they estimate the comet formed around 7 billion years ago in the galaxy\u2019s ancient thick disk, orbiting a young star\u2014until something ejected it, though we don\u2019t know what. Its many gravitational encounters over time make it nearly impossible to trace back to its star of origin.<\/p>\n

The location of Interstellar Object \/ Comet 3I\/ATLAS today (August 25, 2025), as it approaches the Psyche spacecraft (and as team Psyche prepares to observe it).
See https:\/\/t.co\/vcNHNx8Egh<\/a> for more. pic.twitter.com\/Nc7MKteWq2<\/a><\/p>\n

\u2014 Space Initiatives (@AsteroidEnergy) August 25, 2025<\/a> <\/p>\n

Alien tech? Not likely.<\/p>\n

Of course, there\u2019s always speculation. Harvard physicist Avi Loeb and his followers suggest 3I\/Atlas could be an artificial object. They\u2019ve even questioned the delay in releasing images from the James Webb Space Telescope, which observed the object in August. Those images are now public\u2014but the debate hasn\u2019t entirely stopped.<\/p>\n

3I\/ATLAS photographed by SPHERE-X (slide 1) versus James Webb (slide 2). If you compare the two images, you can see an expected amount of “noise” in slide 1, but “no noise” and “broad smearing” in slide 2.
They did this by setting the pixel sizes for slide 2, much larger than\u2026 pic.twitter.com\/MS0iCXf5bT<\/a><\/p>\n

\u2014 Red Collie (Dr. Horace Drew) scientist\/inventor (@RedCollie1) August 26, 2025<\/a> <\/p>\n

JWST detected what you\u2019d expect: a fuzzy coma, volatile ices, and common molecules like water, CO\u2082, and carbon monoxide. While the ratios were a bit surprising, scientists say they could even out once the comet gets closer to the Sun and releases more water.<\/p>\n

So, is it an alien spacecraft? Highly unlikely. And upcoming observations should put that theory to rest. Data is expected soon from NASA\u2019s Psyche mission, followed by probes near Mars and the Juice mission en route to Jupiter. There\u2019s even a chance that Europa Clipper, Hera, or Lucy could pass through the comet\u2019s tail in the coming weeks.<\/p>\n

By November, Hubble will analyze the gas emissions<\/a> using ultraviolet spectroscopy, including the sulfur-to-oxygen ratio. It\u2019ll also monitor 3I\/Atlas as it exits the solar system. JWST, meanwhile, won\u2019t take another look until December.<\/p>\n

\"mayer-nathalie\" <\/p>\n

\t\t\t Nathalie Mayer <\/p>\n

\n Journalist <\/p>\n

Born in Lorraine on a freezing winter night, storytelling has always inspired me, first through my grandmother’s tales and later Stephen King’s imagination. A physicist turned science communicator, I’ve collaborated with institutions like CEA, Total, Engie, and Futura. Today, I focus on unraveling Earth’s complex environmental and energy challenges, blending science with storytelling to illuminate solutions.<\/p>\n

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