Astronomers spot over 20,000 supernovas every year, but this one stands out.
This new supernova is the closest to Earth in a decade. It's visible in the night sky right now.
Since Itagaki reported the observation to the International Astronomical Union that night, the brightening star in the Pinwheel Galaxy has become the most studied object in the night sky. Both the world's largest scientific telescopes and amateur skywatchers around the globe have turned their lenses toward the freshly exploded, which has since been declared the nearest supernova explosion in the last five years.
Daniel Perley, an astrophysicist at Liverpool John Moores University, told Space.com that thanks to the large quantity of available observations of the galaxy taken by both amateurs and professionals, astronomers might be able to pin down the exact moment of the explosion to within minutes. "Usually, when a supernova is found, it's already a day, two days, three days, even a week after the explosion when we first see it," Perley said."This one was found within hours of the actual initial explosion of the star, and we may even be able to get that down to a few minutes after we collect some of the amateur data that people have been incidentally taking of the galaxy.
With today's technology, supernova detections are not rare. According to Cardiff University astrophysicist Cosimo Inserra, powerful survey telescopes find several supernovas every night. Within a single year, more than 22,000 so-called transient events, sudden powerful brightenings in galaxies, can be discovered. This number includes supernovas, but also stars shredded by"On average, the distance of the majority of these transients is up to redshift 0.1," Inserra said.
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