Astronomy and astrophysics

MIT researchers have discovered space matter that has been ‘missing’ since the 1990s using Fast Radio Bursts, individual flashes of radio waves traveling through space and coming from the distant universe, reports WCVB 5’s Cindy Fitzgibbon. “The takeaway of the study is that by discovering the distribution of the missing matter around galaxies, we have found evidence for strong activities in galaxies,” says graduate student Haochen Wang, a co-author on the study. “In other words, galaxies are busier and messier than we thought.” 

Prof. Salvatore Vitale and graduate student Cailin Plunkett join John Batchelor and David Livingston, hosts of the Hotel Mars podcast, to discuss their discovery that 14% of black holes were created from the merger of two smaller ones, and their goal to use gravitational wave detectors to uncover the origins of the black hole in the Milky Way. “In ten years [with added gravitational wave technology and observatories], we’ll go from seeing the first gravitational wave ever to seeing them irrespective of where they happen in the universe—which would of course, be fantastic,” says Vitale.  

New Scientist’s Jacklin Kwan highlights Prof. Christoph Kehle’s work demonstrating that extremal black holes, a variety of black hole that has zero temperature, could exist. “Extremal black holes were thought of as an idealised, unattainable limit: something you could write down as a solution, but which could never be reached [through any real physical] process, but we proved that wrong,” says Kehle. 

Prof. Richard Binzel discusses Apophis, an asteroid roughly 340-meters in diameter, set to pass within 32,000 kilometers of Earth on April 13, 2029 with Scientific American’s Andrew Jones. Apophis’s close approach in 2029 will offer “a once-per-millennium natural experiment,” says Binzel.  

In a video for PBS Nova, alumna Elba Alonso-Monsalve PhD ‘26 explains the definition of primordial black holes (PBHs), and how dark matter may be formed from them. “Think like the mass of an asteroid but packed into the volume of a single atom, and these [PBHs] would be floating around our universe, maybe even our own solar system,” says Alonso-Monsalve. “There could be enough of these PBHs lurking around to make up all of the dark matter, and they would be tiny enough to be hard to spot.” 

By studying ‘smears’ in fast radio bursts, fleeting flashes of radiation, MIT researchers discovered diffuse clouds of baryonic gas may contain the missing ordinary matter in the universe, writes Gizmodo’s Gayoung Lee. “These diffuse clouds may be flung outside galaxies through black hole jets,” Lee explains. 

Prof. Brett McGuire joins Peter O'Dowd, host of WBUR’s “Here & Now,” to discuss astronomers’ discovery of Erythrulose, the sugar found in raspberries, in clouds of gas about 25,000 light-years away from Earth. “By a chemist's formal definition this is a sugar—given its structure, the way its atoms are bonded together,” says McGuire. "It’s not the sort of sugar that we think of as involved in making things sweet for us. But it is still a sugar in that it is a compound that stores energy and is involved in biological processes that access that energy and allow it to be used by living organisms." 

After analyzing data from the LIGO, Virgo and KAGRA gravitational wave detectors, MIT researchers have found that 14% of black holes may be second-generation, formed by the merger of two smaller black holes, writes Gayoung Lee for Gizmodo. The scientists “created an analytic model to capture the kind of wobble that would have emerged from second-generation black holes. Around 14% of merging black holes followed this pattern, and the second-generation black holes identified had a very specific range of masses, at around 20 solar masses or 40 solar masses and above,” Lee explains.  

Prof. David Kaiser joins GBH “Particles of Thought” podcast host Dr. Hakeem Oluseyi to discuss his hunt for primordial black holes. “It’s a lot easier to find stuff coming off of a very bright, hot source, than a cold, dim one. So, the Hawking temperature of a black hole that has the same mass as our sun, or a little bigger would be so cold we would literally never be able to measure [its] radiation,” says Kaiser. “You’ll never see it [Hawking Radiation] from stellar collapse black holes, you’ll never see it from supermassive black holes, or even colder. The only hope to ever see it would be a smaller mass black hole.”

Prof. Alan Guth chats with Scientific American reporter Joseph Howlett about the future of the field of cosmology and his advice for early-career physicists for “The Young American Scientists” special section. Guth shares that thanks to advances in technology, “we’re able to unravel, to make sense out of, what we’re observing. A lot of progress has been made on those lines.” 

Scientific American reporter Clara Moskowitz spotlights a new study by Prof. Seth Lloyd that explores the feasibility of black holes sending information back in time. In the study, Lloyd and his colleagues calculate how much information can be sent backward via closed timelike curves, intensely bending, rotating space found around spinning black holes. “Spacetime can curve around so much that you can be innocently going forward in time and then you meet yourself in the past,” says Lloyd. 

GBH "Particles of Thought" host Hakeem Oluseyi interviews Prof. David Kaiser about the puzzling nature of dark matter and how its explanation may be inconsistent with our assumptions of gravity. “If we assume we really know the laws of gravity, which Einstein wrote down beautifully just over a hundred years ago in his general theory of relativity...we have reason to be confident. But what people are saying is could dark matter be the first exception to that,” says Kaiser. 

Prof. Anna Frebel speaks with Science reporter Jay Bennett about the “first unambiguous second-generation star found in an ultrafaint dwarf galaxy.” It’s a fantastic discovery,” says Frebel. “I know how hard it is to find these stars. They are so, so rare.” 

Prof. David Kaiser and graduate student Alexandra Klipfel speak with New York Times reporter Dennis Overbye about their theory that a neutrino detected zipping through the Mediterranean Sea in February 2023 may have come from an exploding primordial black hole. Kaiser and Klipfel "concluded that if primordial black holes were the explanation for long-sought dark matter, scientists should expect about 40 black-hole explosions to occur each year in every cubic light-year near the Milky Way,” Overbye notes. 

Prof. Julien de Wit speaks with Dan Rea from WBZ’s Nightside News about his team’s work developing new ways to address threats posted by small asteroids to our critical space infrastructure. “We are developing the technology here at MIT to find [asteroids] and then track them and understand if we should be caring about them,” de Wit explains.