The Puppis A supernova remnant is one of the most intriguing and interesting objects in the sky. Slightly overlooked because it's partly hidden behind the nearer Vela remnant, it is the result of an explosion whose light reached Earth about 3,700 years ago. Since then, the bubble of shocked gas has expanded to a diameter of about 100 lightyears, at the centre of which is one of the brightest X-ray sources in the entire sky.
Of particular interest is what lies within the main body of the remnant. In images taken in both X-ray and visible light, there is a set of nested and overlapping rings. Named 'The Swirl' by its discoverer Frank Winkler (making it the object in the sky which most sounds like something a Star Trek captain would encounter), it was originally thought to be the signature of a second supernova taking place within the remnant of the first.
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Could We Find Aliens by Looking for Their Solar Panels?- Designed to reflect ultraviolet and infrared, the panels have a unique fingerprint
Researchers searching for life beyond Earth spend a lot of time thinking about what telltale signs might be detectable astronomically. Forms of unambiguous evidence for the presence of life on another world are known as biosignatures. By extension, techno signatures are indicators of activity by intelligent, civilisation-building life.
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The Big Bang produced a Universe filled almost exclusively with hydrogen and helium; all other elements - what astronomers call metals - were produced by stars, supernovae and everything that happens later. So if you can pick out a pristine star with no metals polluting it from among the billions in the Milky Way, then you are likely to have a star dating from our Galaxy's earliest days.
Inside The Sky At Night - Two years ago, exoplanet scientist Hannah Wakeford received some of the first data from the JWST
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