When you buy through links on our articles, Future and its syndication partners may earn a commission.Using artificial intelligence and data from the groundbreaking Vera C. Rubin Observatory, scientists are reconsidering our knowledge of “standard candles” in the cosmos. These are objects that result from explosions provoked by dead stars that act like cannibals — and they help us measure distances across the universe.These standard candles are also called Type 1a supernovas, and their distance-measuring role is integral to measuring the rate at which the universe is expanding. This means they’re also integral in our understanding of how this expansion is accelerating due to the effect of dark energy, the mysterious force helping to push our cosmos apart in every direction.AdvertisementAdvertisementThe research team’s approach to looking at these Type 1a supernovas involves what’s known as a combined inference and galaxy-related standardization, or CIGaRS, framework. It differs from a more standard approach because, instead of using spectroscopic observations — which revolves around analyzing light signatures — it looks at actual images and a mathematical analysis. This approach, the team explains, allows astronomers to determine more about the age and concentration of heavy elements — collectively known as “metals” in astronomy — in the stars that explode in Type 1a supernovas. That’s important because it can reveal the stars’ distances more precisely.”A powerful way of modeling the universe is to simulate it in the computer,” research team member Raúl Jiménez of the University of Barcelona said in a statement. “This provides a way to vary all possible parameters at the same time to predict what universe we live in.”Furthermore, by having this capacity, one can look into possible ‘unknown unknown’ systematics to understand their effect. The impact of these systematics in our inference is arguably the most important missing ingredient in current approaches to model the universe.”Recapping the dark energy problem and cannibal starsOur discovery of dark energy began with the death of stars of similar sizes to the sun and their transformations into smoldering stellar embers called white dwarfs. The sun will end its life as a white dwarf in around 6 billion years, fading alone in a cosmic graveyard that was once our solar system. However, when stars have a binary …
