Space and astronomy news
There’s an unusual object near the Milky Way’s heart that astronomers call “The Brick.” It’s a massive cloud of gas called an infrared dark cloud (IDC). The Brick is dense and turbulent like others of its type, but for some reason, it shows few signs of star formation.
Why?
Continue reading “JWST Gazes into the Dark Molecular Clouds at the Heart of the Milky Way”
In 1985, the physicist Heinz Pagels wrote that star birth was a “veiled and secret event.” That’s because the stellar crêches hide the action. But, ever since the advent of infrared astronomy, astronomers have been able to lift that veil. In particular, the Hubble Space Telescope has studied these systems and now, the Webb Telescope (JWST) gives regular detailed views of stellar nurseries.
Continue reading “JWST Pierces Through a Thick Nebula to Reveal Newly Forming Binary Stars”
The ancient Universe is weird and secretive. Scientists have made laudable progress in uncovering more and more information on how the Universe began and what conditions were like all those billions of years ago. Powerful infrared telescopes, especially the ground-breaking James Webb Space Telescope, have let astronomers study the ancient light from the early Universe and remove some of the secrecy.
One of the mysteries astronomers want to untangle concerns star formation. Has it changed much since the Universe’s early days?
Continue reading “Star Factories Haven’t Changed Much Over the Entire Age of the Universe”
A stellar nursery sounds like a placid place where baby stars go about their business undisturbed. But, of course, a stellar nursery is nothing like that. (Babies are noisy and cry a lot.) They’re dynamic places where powerful elemental forces rage mightily and bend the surroundings to their will. And this one, even though its name is the drowsy-sounding Smiling Cat Nebula, is no exception.
Continue reading “A Feline in the Heavens: The Smiling Cat Nebula”
The first stars of the universe were very different than the stars we see today. They were made purely of hydrogen and helium, without heavier elements to help them generate energy in their core. As a result, they were likely hundreds of times more massive than the Sun. But some of the first stars may have been even stranger. In the early universe, dark matter could have been more concentrated than it is now, and it may have powered strange stellar objects known as dark stars.
Continue reading “Nancy Grace Roman Could Detect Supermassive Dark Stars”
FU Orionis is an unusual variable star. It was first seen as a magnitude 16 star in the early 1900s, but in the mid-1930s it rapidly brightened to a magnitude 9 star. The rapid brightening of a star was not unheard of, but in this case, FU Orionis did not fade to its original brightness. Since 1937 it has remained around magnitude 9, varying only slightly over time. For decades the mysterious star was thought to be unique, but in the 1970s similar stars were observed, and are now known as FU Orionis objects. Astronomers still had no real idea what could cause such a dramatic change, but a new study argues that it could be caused by a dying young planet.
Continue reading “An Unfortunate Planet is Undergoing “Extreme Evaporation,” Melting Under the Extreme Heat From its Star”
A few days ago I wrote about the search for Population III stars. These stars were the first stars of the universe. Giant beasts hundreds of times more massive than the Sun, composed only of hydrogen and helium. These massive stars would have been very short-lived, exploding as brilliant supernovae in less than a million years. But Population III stars were so massive, their supernovae were uniquely different from the ones we see today, so our best way to find evidence of them is to look for their supernova remnants. And a recent study published in Nature may have found some.
Continue reading “More Evidence of Massive First Generation Stars”
The Tarantula Nebula is a star formation region in the Large Magellanic Cloud (LMC). Tarantula is about 160,000 light-years away and is highly luminous for a non-stellar object. It’s the brightest and largest star formation region in the entire Local Group of galaxies.
But it shouldn’t be.
Continue reading “The Tarantula Nebula Shouldn’t Be Forming Stars. What’s Going On?”
Star formation is one of the oldest processes in the Universe. In the Milky Way and most other galaxies, it unfolds in cold, dark creches of gas and dust. Astronomers study sites of star formation to understand the process. Even though they know much about it, some aspects remain mysterious. That’s particularly true for the “Nessie Nebula” in the constellation Vulpecula. An international team led by astronomer James Jackson studies the nebula and its embedded star-birth regions. They found that it experienced a domino effect called “triggered star formation.”
Continue reading “Triggered Star Birth in the Nessie Nebula”
Star formation is an intricate process governed by a swarm of variables, and it all happens behind a thick veil of dust. Astrophysicists understand it to a certain degree. But this is nature, and nature doesn’t give up its intimate secrets without a concentrated effort.
To learn more about the star formation process, astronomers imaged five star-forming regions in the southern hemisphere with the ESO’s VISTA telescope. It took five years and over one million images, and the result is the VISIONS survey.
Continue reading “It Took Five Years and A Million Images to Make this Atlas of Stellar Nurseries”