3I/ATLAS Today (Nov. 7, 2025): New green-glow image, ‘color‑change’ myth debunked, and where to see the interstellar comet now
Updated: Nov. 7, 2025 — This roundup focuses on developments reported today (7.11.2025). Key updates at a glance What scientists reported today Green glow, “hidden” tail—here’s the physics. A new image captured with the Lowell Discovery Telescope shows 3I/ATLAS brightest through a filter sensitive to diatomic carbon (C₂), which fluoresces green in sunlight. The dust tail isn’t gone—you’re seeing it almost head‑on, so it blends with the coma and appears subdued. That geometry explains images where the tail seems to “disappear.” Live Science No, it hasn’t “changed color.” A preprint that compared sun‑skirting observations led to headlines about dramatic hue