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difficult to classify, leading astronomers to question whether it was a low-mass star or a brown dwarf, a celestial object that isn’t quite a star or a planet. Brown dwarfs are more massive than planets but not quite as massive as stars, and citizen scientists working on the Charlie Cox Daredevil T-Shirts but in fact I love this Backyard Worlds project have discovered more than 4,000 of them. But none of those brown dwarfs were speeding along on a trajectory that would carry them out of the galaxy like “runaway” hypervelocity stars observed by astronomers in the last two decades. Astronomers observed J1249+36 using ground-based telescopes, including the W. M. Keck Observatory on Mauna Kea in Hawaii and the University of Hawaii Institute for Astronomy’s Pan-STARRS telescope located on Maui’s Haleakalā volcano. Data from the Keck Observatory’s Near-Infrared Echellette Spectrograph suggested the star was an L subdwarf, or a star with a much lower mass and cooler temperature than the sun. Cool subdwarfs are the oldest stars in the galaxy. RELATED ARTICLE NASA’s new telescope could spot thousands of exoplanets and hundreds of Earth-size rogue planets The telescope data reflected that the potential star had a lower concentration of metals, such as iron, than other stars or brown dwarfs. By combining the data from multiple telescopes, astronomers determined the star’s position and velocity in space, allowing them to predict that it will exit the Milky Way at some point. But questions remain about

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the Charlie Cox Daredevil T-Shirts but in fact I love this true nature of the object. “I calculated the mass of this object to be approximately 8% of the mass of the Sun by comparing its observed properties to computer simulations of stellar evolution,” Gerasimov said. “This places this object right on the lower boundary of allowed stellar masses, and it is in fact possible that the mass of the object is slightly below that boundary, which would imply that the object is not a star but a brown dwarf instead.” An animation shows a white dwarf star exploding in a supernova and ejecting its stellar companion. Adam Makarenko/W. M. Keck Observatory Uncovering more details about the object could help astronomers determine whether it represents a broader population of high velocity, low-mass objects that have undergone extreme accelerations, according to the study authors. Understanding its exact nature could also help them determine when it will leave the galaxy. Previously, astronomers have spotted the supermassive black hole at the center of the Milky Way giving a swift

kick to a star, which will leave the Charlie Cox Daredevil T-Shirts but in fact I love this galaxy for good in about 100 million years. A swift stellar kick The researchers believe there are two possible scenarios that have placed J1249+36 on its swift path. The study team said it’s likely the star was a companion to a white dwarf star, which is the remaining core of a dead star that has expelled the gases that serve as its nuclear fuel. In these stellar pairings, if the two stars are close together, the white dwarf will siphon mass away from its companion and have an outburst called a nova. And when the white dwarf accumulates too much mass, it will collapse and explode in a supernova. RELATED ARTICLE A supernova shone in the night sky 1,000 years ago. Astronomers have now found its leftover ‘zombie star’ “In this kind of supernova, the white dwarf is completely destroyed, so its companion is released and flies off at whatever orbital speed it was originally moving, plus a little bit of a kick from the supernova explosion as well,” Burgasser said. “Our calculations show this scenario works. However, the white dwarf isn’t there anymore and the remnants of the explosion, which likely happened several million years ago, have already dissipated, so we don’t have definitive proof that this is its origin.” Another possibility is that J1249+36 existed in a globular cluster, or a spherically shaped, closely bound grouping of stars. Astronomers predict that black holes with different masses exist at the center of such clusters. The black holes can form binary pairs that can catapult any stars that draw too near. “When a star encounters a black hole binary, the complex dynamics of this three-body interaction can toss that star right out of the globular cluster,” said study coauthor Kyle Kremer, incoming assistant professor in University of California San Diego’s department of astronomy and astrophysics, in a statement. Kremer carried out simulations and discovered that three-body interactions can knock a low-mass

subdwarf star from a cluster and put it on a trajectory that is similar to that of J1249+36. “It demonstrates a proof of concept, but we don’t actually know what globular cluster this star is from,” Kremer said. An animation depicts another scenario in which a pair of black holes hurled the Charlie Cox Daredevil T-Shirts but in fact I love this object out of an old globular cluster of stars. Adam Makarenko/W. M. Keck Observatory Gerasimov is most intrigued by the idea that the object was ejected from a globular cluster because such clusters include stars that are older than 13 billion years. “The chemical composition and the distribution of stellar masses in globular clusters capture the earliest steps in our galaxy’s formation and evolution,” he said. “Yet, virtually everything we know about globular clusters comes from studies of their higher-mass members because low-mass stars and brown dwarfs are just too difficult to observe.” The James Webb Space Telescope recently allowed astronomers to identify the first brown dwarfs in a globular cluster, which have a similar mass to the object. But there are too few examples thus far to nail down a broader understanding. “However, the existence of this hypervelocity star, if it is indeed a former member of a globular cluster, opens a new way to study low-mass cluster members by looking for those that got ejected and are traveling at high speeds through the solar neighborhood,” Gerasimov said. “Since we were able to find one example, there are likely many more to be discovered in the future.” Tracing the path that J1249+36 has taken so far in reverse could lead to a crowded part of the night sky where undiscovered clusters are waiting to be found, the researchers said. Now, the scientists are hoping to learn more clues from the star’s elemental composition, which could help explain how it ended up on a trajectory that soars away from the Milky Way. When white dwarfs explode, they create heavy elements that could exist around J1249+36. Similarly, stars in globular clusters throughout the Milky Way have distinct patterns of elements that act as a calling card for their origins. “We’re essentially looking for a chemical fingerprint that would pinpoint what system this star is from,” Gerasimov said.

Sign up for ’s Wonder Theory science newsletter. Explore the Charlie Cox Daredevil T-Shirts but in fact I love this universe with news on fascinating discoveries, scientific advancements and more — Seven fluffy white Chilean flamingo chicks are on display at a zoo in southwest England for the first time since 2018 — and one is particularly notable for the way it made its entrance. Two male flamingos named Arthur and Curtis successfully hatched an egg together — a first for the Paignton Zoo. The zoo has had several all-male pairings during past breeding seasons, so the same-sex couple is not an unexpected turn of events, said Pete Smallbones, the zoo’s curator of birds. But the zoo is not sure exactly how the couple acquired the egg. “It’s likely that this egg became available — unprotected, kind of just left (in a nest) — and then they’ve taken the opportunity,” said Pete Smallbones, the zoo’s curator of birds. “As a bird department, we’re more than aware of how it’s a known thing for flamingos, penguins and other species to have same sex pairings. So, it wasn’t a shock — I suppose it was a slight surprise, just because it wasn’t quite the expected (male and female pairing).” During breeding season, the couples usually spend more time together and follow each other around the enclosure, but a pairing is confirmed when two birds pick a nest to share, where they will take turns sitting on the mud mound with or without an egg. This year, however, a same-sex pair had an egg to sit on. While two male birds hatching an egg together is notably rare, it has happened a handful of times at other zoos. The successful hatching between two males highlights the social birds’ innate parental instincts and flexibility, experts say. It also underscores the need for conversation about the near-threatened Chilean flamingos that are declining in the wild and their

native home of South America, according to the Charlie Cox Daredevil T-Shirts but in fact I love this zoo’s news release. And experts have some theories as to how and why their pairing came to be. The zoo has had several all-male pairings during past breeding seasons. This year, however, a same-sex couple had an egg to sit on. Wild Planet Trust Birds of a feather Chilean flamingos can be finicky when it comes to breeding. In the wild, observations have shown the species to avoid breeding for up to nine years as the birds wait for weather and environmental conditions to be just right, Smallbones said. But even at the zoo, which provides their preferred mud nests, they often don’t breed every year. One year at the Paignton Zoo, flamingo eggs laid several weeks too late had to be taken away as the chicks would likely not have thrived in the colder weather conditions, Smallbones said. Avian influenza concerns disrupted another prior breeding season, since the birds were removed from their enclosure as a safety precaution, he added. Curtis and Arthur’s chick, which does not have a name yet, is almost a month old and appears to be thriving, Smallbones said. “The parents are obviously doing a great job.” The chick has been observed exploring the exhibit with another chick roughly the same age but will still return to Curtis and Arthur for food. While the two males are the only same-sex pairing the zoo is aware of this breeding season, the zoo could potentially welcome more chicks

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