planetary defense

Interstellar Comet 3I/ATLAS on 18 November 2025: New Multi‑Tailed Image, NASA’s Big Reveal and a Planetary‑Defense Rehearsal

Updated 18 November 2025 Interstellar comet 3I/ATLAS is having a huge day in the headlines. As of today, 18 November 2025, astronomers have unveiled a spectacular new multi‑tailed image, NASA has confirmed details of a live global broadcast tomorrow to share the sharpest spacecraft images yet, and new research is sharpening its role as a test case for defending Earth from future cosmic intruders. At the same time, fresh comments from Harvard astronomer Avi Loeb are reigniting online speculation that 3I/ATLAS might be something more than a comet – speculation that most planetary scientists still firmly reject. www.ndtv.com+2Sky at Night Magazine+2 Key 3I/ATLAS updates for 18 November 2025

18 November 2025

Hidden ‘Planet-Killer’ Asteroid Found in Sun’s Glare Exposes Dangerous Blind Spot

A “Twilight” Asteroid Breaks Speed Records Astronomers are buzzing about 2025 SC79, a newfound asteroid that’s zipping around the sun at near-record pace. Scott S. Sheppard, an astronomer at Carnegie Science, first spotted the object on September 27 using the Blanco 4-meter telescope in Chile carnegiescience.edu carnegiescience.edu. What he found was astonishing: an asteroid orbiting the sun in just 128 days, making it the second-fastest asteroid ever recorded space.com. Only one known asteroid orbits faster – 2021 PH27, a 1-km rock discovered by Sheppard in 2021 that races around the sun in 113 days livescience.com. Even Mercury, the innermost planet, takes

26 October 2025

Asteroids · Astronomy · Cosmic Hazards · Planetary Science · Space News

‘God of Chaos’ Asteroid Apophis to Skim Earth in 2029 – Inside the Historic Flyby and the 3 Probes Racing to Study It

Astronomers Propose Blowing Up a Potentially Hazardous Asteroid

Key Facts and Summary The Asteroid 2024 YR4: From Earth Hazard to Lunar Threat 2024 YR4 is a recently discovered asteroid that has drawn intense attention from astronomers and space agencies. Detected on 27 December 2024 by the ATLAS survey telescope in Chile, it initially appeared on a worrisome trajectory esa.int. In early 2025, automated orbit calculations raised the alarm that this ~60-meter “city-killer” asteroid had a roughly 3% chance of impacting Earth on December 22, 2032 esa.int universetoday.com. A few percent might sound small, but by asteroid risk standards it’s huge – for context, NASA’s risk list almost never

23 September 2025

Asteroids · Astronomy · Planetary Defense · Science News · Space