“But comets happen to be a very rich source of hydrogen — primarily by water of water-ice being vaporized by the Sun — and so they often glow quite brightly in the SWAN images.” Zang first ...

For the record, C/2025 F2 (SWAN) was independently identified in the SWAN images by amateur astronomers Ukraine-based Vladimir Bezugly, Michael Mattiazzo in Australia and Rob Matson from the US.

Amateur astronomers Vladimir Bezugly from Ukraine, Michael Mattiazzo in Australia and US-based Rob Matson each independently spotted and reported the object, known as Comet SWAN or SWAN25F, while ...