Nation A supernova ‘only’ 21 million light-years away has been spotted. Here’s how you can see it. May 24, 2023May 24, 2023Doyle Rice, USA TODAYComments Off on A supernova ‘only’ 21 million light-years away has been spotted. Here’s how you can see it. A star exploded as a supernova in the Pinwheel Galaxy in Ursa Major, Sky and Telescope reports. It's bright enough to see with a small telescope.