Space Exploration 31 October 2025 - 12 November 2025

Roundup of the biggest science stories breaking on November 12, 2025. From a rare G4 geomagnetic storm lighting up the skies to fresh clues about life-friendly chemistry and planetary formation, here’s what matters — and why.

Radio proof of “cometness.” After weeks of speculation, astronomers have the clearest radio evidence yet that 3I/ATLAS behaves like a normal comet: MeerKAT detected hydroxyl absorption at 1665 and 1667 MHz during a deep observation on Oct. 24 while the object was near the Sun in the sky. OH is produced when water from a comet’s coma is broken apart by sunlight, and these specific radio lines are a textbook marker of that process. The team also notes earlier non‑detections on Sept. 20 and 28, underscoring that activity ramped up near perihelion. The Astronomer's Telegram

Some Nov. 5–9 images show a compact coma with little obvious dust tail, which has fueled social-media claims that 3I/ATLAS is behaving “unlike a comet.” But experts caution that viewing geometry matters: a tail can be foreshortened or lost in glare, and gas emissions can dominate the appearance around perihelion. Two days ago Space.com quoted Lowell Observatory’s Qicheng Zhang: there’s no solid evidence the coma “changed color”; instead, the gas coma is simply contributing more to the comet’s brightness. Meanwhile, a fresh deep stack highlighted today shows multiple jets, including a sunward anti‑tail—a geometry sometimes seen in comets when dust sheets align with our line of sight. In short: images are real, interpretations are still being tested. Space+1

Comet 3I/ATLAS — only the third confirmed interstellar object to sweep through our solar system — has reemerged from behind the sun and is sliding into the predawn sky this week. Fresh spacecraft imagery, a flurry of social media claims about its “missing tail,” and ongoing questions about color changes have made it the most watched rock‑ice visitor of the season. Here’s what’s new today, what’s reliable, and how to see it yourself. Space

Key points

A wave of coverage on Friday highlighted a new Nature Astronomy study that sets a concrete target for the next generation of black hole images: if upcoming telescopes can reach percent‑level fidelity, they could tell Einstein’s black holes apart from a range of look‑alikes predicted by alternative theories of gravity. The paper—published November 5—uses advanced simulations to show that when the mismatch between images exceeds roughly 2–5%, future instruments should be able to rule out many non‑Einstein models. Nature

A new analysis of NASA’s Cassini data finds excess heat at Enceladus’ north pole, balancing previously known heat loss in the south. The results, published Nov. 7, 2025 in Science Advances, suggest the icy moon’s global ocean has remained stable over geologic time—strengthening its habitability. Science+3SciTechDaily+3Space+3

Updated: November 7, 2025 — Interstellar comet 3I/ATLAS has re-emerged from behind the Sun and is back on astronomers’ morning watch lists. Fresh coverage today highlights new imagery from Mars orbit, public tools to follow its path, and why agencies are mobilizing to study only the third confirmed interstellar object ever seen. Space+2WIRED+2

Summary

Today’s big development: China’s Tianwen‑1 Mars orbiter captured and released new images of the interstellar comet 3I/ATLAS, taken from roughly 30 million km away during the comet’s October 3 pass near Mars. China’s state outlets say the sequence shows clear cometary features and marks one of the closest probe‑based looks at the object to date. The observation doubles as a technology pathfinder for China’s upcoming Tianwen‑2 mission. State Council of China+2Xinhua News+2

China’s space agency says the Tianwen‑1 Mars orbiter used its high‑resolution camera to observe 3I/ATLAS during the object’s close pass by Mars, when the spacecraft was ~30 million km from the comet—one of the nearest probe‑based looks so far. The agency released images and a brief 30‑second sequence showing the comet’s motion, adding that the observation also serves as a technical pathfinder for future small‑body missions. Xinhua News

When astronomers spotted a faint new comet on July 1, 2025, they quickly realized it was no ordinary comet. Its official designation, 3I/ATLAS, tells the tale: “3I” means it’s the third interstellar object ever recorded, and “ATLAS” credits the Asteroid Terrestrial-Impact Last Alert System survey telescope that discovered itscientificamerican.com. In the days following discovery, observatories around the world rushed to calculate its orbit – and the results were stunning. Unlike normal comets bound in elliptical orbits around the Sun, 3I/ATLAS was on a one-way hyperbolic trajectory, unbound to our stareconomictimes.indiatimes.com. It was barreling into the inner solar system at nearly 137,000 mph relative to the Sunscientificamerican.com – far too fast to have originated here. Projecting its path backward revealed that it came from far outside the solar system, and once it swings past the Sun, it will escape back into interstellar space rather than looping back aroundeconomictimes.indiatimes.comnewsweek.com.

On July 1, 2025, astronomers in Chile spotted a faint, fast-moving object that immediately stood out. Follow-up measurements showed it was on a hyperbolic orbit – not bound to our Sun – confirming it came from interstellar spacets2.tech. The discovery was officially designated 3I/ATLAS, where “3I” denotes the third Interstellar object ever observed, and “ATLAS” credits the NASA-funded Asteroid Terrestrial-impact Last Alert System survey that found itts2.tech.

Image: Interstellar comet 3I/ATLAS, captured by the Gemini South Observatory in late 2025, showing a diffuse coma and tail against the stars. This “ghostly” haze of gas and dust confirms that 3I/ATLAS is an active comet venting material as it nears the Sun. Space Wikipedia