Astronomers have discovered the farthest star yet, a super-hot, super-bright giant that formed nearly 13 billion years ago at the dawn of the cosmos.
By Marcia Dunn
Astronomers have discovered the farthest star yet, a super-hot, super-bright giant that formed nearly 13 billion years ago at the dawn of the cosmos.
But this luminous blue star is long gone, so massive that it almost certainly exploded into bits just a few million years after emerging. Its swift demise makes it all the more incredible that an international team spotted it with observations by the Hubble Space Telescope. It takes eons for light emitted from distant stars to reach us.
“We’re seeing the star as it was about 12.8 billion years ago, which puts it about 900 million years after the Big Bang,” said astronomer Brian Welch, a doctoral student at Johns Hopkins University and lead author of the study appearing in Wednesday’s journal Nature.
“We definitely just got lucky.”
He nicknamed it Earendel, an Old English name which means morning star or rising light — “a fitting name for a star that we have observed in a time often referred to as `Cosmic Dawn.′ ”
The previous record-holder, Icarus, also a blue supergiant star spotted by Hubble, formed 9.4 billion years ago. That’s more than 4 billion years after the Big Bang.
In both instances, astronomers used a technique known as gravitational lensing to magnify the minuscule starlight. Gravity from clusters of galaxies closer to us — in the foreground — serve as a lens to magnify smaller objects in the background. If not for that, Icarus and Earendel would not have been discernible given their vast distances.
While Hubble has spied galaxies as far away as 300 million to 400 million years of the universe-forming Big Bang, their individual stars are impossible to pick out.
“Usually they’re all smooshed together ... But here, nature has given us this one star — highly, highly magnified, magnified by factors of thousands — so that we can study it,” said NASA astrophysicist Jane Rigby, who took part in the study. “It’s such a gift really from the universe.”
Vinicius Placco of the National Science Foundation’s NOIRlab in Tucson, Arizona, described the findings as “amazing work.” He was not involved in the study.
Placco said based on the Hubble data, Earendel may well have been among the first generation of stars born after the Big Bang. Future observations by the newly launched James Webb Space Telescope should provide more details, he said, and “provide us with another piece of this cosmic puzzle that is the evolution of our universe.”
Current data indicate Earendel was more than 50 times the size of our sun and an estimated 1 million times brighter, outsizing Icarus. Earendel’s small, yet-to-mature home galaxy looked nothing like the pretty spiral galaxies photographed elsewhere by Hubble, according to Welch, but rather “kind of an awkward-looking, clumpy object.” Unlike Earendel, he said, this galaxy probably has survived, although in a different form after merging with other galaxies.
“It's like a little snapshot in amber of the past,” Rigby said.
Earendel may have been the prominent star in a two-star, or binary, system, or even a triple- or quadruple-star system, Welch said. There’s a slight chance it could be a black hole, although the observations gathered in 2016 and 2019 suggest otherwise, he noted.
Regardless of its company, the star lasted barely a few million years before exploding as a supernova that went unobserved as most do, Welch said. The most distant supernova seen by astronomers to date goes back 12 billion years.
The Webb telescope — 100 times more powerful than Hubble — should help clarify how massive and hot the star really is, and reveal more about its parent galaxy.
By studying stars, Rigby said: “We are literally understanding where we came from because we’re made up of some of that stardust.”
___
The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.
Ellen Fitzsimmons-Craft, assistant professor of psychiatry at Washington University School of Medicine, joins Cheddar News to discuss how chatbots can help prevent eating disorders and the research that uncovered these findings.
Shoulder injuries are one of the most common orthopedic injuries – and they're also one of the most commonly ignored. But chimpanzees, with whom we share nearly 99% of our DNA, don’t encounter the same issues we do. So why are human shoulders such a design disaster? Well, we can trace the answer back to a very particular moment in our evolution.
As the Omicron variant continues to sweep across the country. The US Supreme Court is expected to hear arguments at the end of this week on whether or not the Biden administration can force private companies to vaccinate or test millions of their employees. In addition, the National Nurses United has spearheaded legal action to protect nurses and health care workers, patients, and the public while on the job. President of the National Nurses Union, Zenei Cortez, joined Cheddar to discuss more.
Digital medical care provider Pear Therapeutics rang the closing bell on the Nasdaq Friday and President and CEO Dr. Corey McCann, joined Cheddar to talk about how the company plans to grow the business of software-based therapeutics and how the first FDA authorized prescription digital therapeutics company will go about treating illnesses like insomnia and addiction. "These really are pieces of software. In many cases, they're apps and in the cases of our addiction products, these are based on something called cognitive behavioral therapy or CBT," he said. "These products change the patient's brain circuitry to help them be abstinent, to help them stay in treatment, and that's exactly what we see in randomized clinical trials and that's what we see in the real world." He also addressed the ongoing mental health crises brought on by the pandemic. **copy updated to remove IPO information as Pear Therapeutics went public in December**
Jake Carbone, senior data analyst at InfluenceMap joins Cheddar News to talk about a new report by The Guardian and InfluenceMap that reveals how companies are creating fossil fuel ads designed to look like Google search results.
Satellite launch service Virgin Orbit has gone public on the Nasdaq via a SPAC merger with NextGen Acquisitions with a valuation of about $3.2 billion. CEO Dan Hart joined Cheddar's "Between Bells" from in front of his LauncherOne rocket in New York City's Times Square to talk about what's next after the IPO, an upcoming "Above the Clouds" mission to deliver commercial and national security payloads, and the benefits of their rockets being launched from commercial 747 aircraft. "We can launch anywhere in the world," he said. "There are almost 80 space agencies across the world, for instance, and about 10 of them have space launch. We can give them a space flight capability overnight by taking a runway and turning it into a spaceport."
The year 2021 saw numerous natural disasters around the world, including extreme heat and wildfires, rare deep freezes, and historic flooding. This year's United Nations COP26 conference was key for getting world leaders on board with emissions reductions and other climate-focused policies as the UN Secretary-General said the agency's report on global warming is a 'code red for humanity.' In the U.S., President Joe Biden has focused most of his domestic agenda on slashing emissions and building climate-focused infrastructure. Guests from The Economist, UNC-Chapel Hill, Global Rescue, and more join Cheddar Climate's year-end special to discuss how the climate changed in 2021, and what to expect in 2022.
Digital mental health company Little Otter recently announced it closed a $22 million Series A round. Little Otter was founded in 2020 by a mother-daughter team, which based the company on the idea that a child's mental health can only be addressed by treating the whole family through technology available to everyone. Little Otter CEO and co-founder Rebecca Egger and her mother, Little Otter Chief Medical and Scientific Officer and co-founder Dr. Helen Egger joined Cheddar News' Closing Bell to discuss.
Among all the other events of the last few years, you may have missed this one: Spermageddon. This is the fun name for the idea that sperm counts among mainly ‘Western’ men are in freefall. The Spermageddon hype began with the publication of a 2017 study showing a nearly 60% drop in overall sperm counts in men living in North America, Europe, Australia, and New Zealand.
But four years later, it seems that Spermageddon has been overblown. By a lot. And all that hype has obscured the real issue behind declining male fertility.
Covid-19 has changed the way we view wellness. Jillian Hughes, communications director of Mental Health America, joins Cheddar News to discuss breaking the stigma around mental health. Justin Davis, CEO and co-founder of Spectrum Labs, weighs in on how social media impacts our wellbeing. Lastly, Precision Nutrition CEO Timothy Jones advices us on what trends to watch in 2022.
