Comet C/2025 F2 SWAN was discovered by an Australian amateur astronomer. This is how he found it.

Most days, Michael Mattiazzo logs into his computer and looks through public data from a spacecraft orbiting the Sun.

He’s not an astronomer by trade, and he’s not interested in our stellar neighbour.

Instead, he’s hunting comets.

Michael has been doing this for more than two decades, and when…