This week’s image from the James Webb Space Telescope (JWST) shows a stellar eruption called Sharpless 2-284 (or Sh2-284), which is located about 15,000 light-years away. The image provides a beautiful and delicate combination of colors.
We didn’t really know there was a massive star with this kind of super-jet out there before the observation. Such a spectacular outflow of molecular hydrogen from a massive star is rare in other regions of our galaxy. Massive stars, like the one found inside this cluster, have very important influences on the evolution of galaxies. Our discovery is shedding light on the formation mechanism of massive stars in low-metallicity environments, so we can use this massive star as a laboratory to study what was going on in earlier cosmic history.
A team of Pennsylvania State University researchers has a unique take on mysterious red dots first observed by the James Webb Space Telescope. Initially thought to be tiny, crimson galaxies, the red dots are now proposed to be a new and exotic class of celestial object: a hybrid of a black hole and a star, which researchers have dubbed “black hole stars.”
The University of Virginia Occultation Group, astronomy undergraduates who observe and track asteroids and small planets, make most of their observations locally. But they also travel around the country and the world to catch glimpses of heavenly objects, from high-priority asteroid/minor planets and the dwarf planet Pluto to the distant Kuiper Belt object Arrokoth. They observe stellar occultations, which occur when asteroids and minor planets pass in front of distant stars, via telescope. The Group studies some asteroids that later will be studied by close spacecraft fly-bys, and seek out asteroids that may pose a threat to the planet.
Since September 14, 2015, when the Laser Interferometer Gravitational-Wave Observatory (LIGO) made the first-ever direct detection of gravitational waves, the observatory has been making history. Cornell astrophysicists Saul Teukolsky and Larry Kidder earned a share in the 2016 Special Breakthrough Prize in Fundamental Physics – a $3 million award – for their contributions to the project. Now, on the 10th anniversary of LIGO’s first discovery, the LIGO-VIRGO-KAGRA team has announced a black hole merger similar to its first detection. However, thanks to a decade’s worth of technological advances improving the detector sensitivity, the signal is dramatically clearer, allowing unprecedented tests of General Relativity to be performed.
Image (Credit): The protostar IRAS 04302. (ESA/Webb, NASA & CSA, M. Villenave et al.)
This week’s image comes from the James Webb Space Telescope (JWST). It shows the beginning of exoplanets about 525 light-years away. Labeled the ever appealing name of IRAS 04302+2247, or better yet the Butterfly Star, the young star with its protoplanetary disc provides astronomers with plenty of information about the development of a protostar and its solar system.
In stellar nurseries across the galaxy, baby stars are forming in giant clouds of cold gas. As young stars grow, the gas surrounding them collects in narrow, dusty protoplanetary discs. This sets the scene for the formation of planets, and observations of distant protoplanetary discs can help researchers understand what took place roughly 4.5 billion years ago in our own Solar System, when the Sun, Earth, and the other planets formed.
IRAS 04302+2247, or IRAS 04302 for short, is a beautiful example of a protostar – a young star that is still gathering mass from its environment – surrounded by a protoplanetary disc in which baby planets might be forming. Webb is able to measure the disc at 65 billion km across – several times the diameter of our Solar System. From Webb’s vantage point, IRAS 04302’s disc is oriented edge-on, so we see it as a narrow, dark line of dusty gas that blocks the light from the budding protostar at its centre. This dusty gas is fuel for planet formation, providing an environment within which young planets can bulk up and pack on mass.
When seen face-on, protoplanetary discs can have a variety of structures like rings, gaps and spirals. These structures can be signs of baby planets that are burrowing through the dusty disc, or they can point to phenomena unrelated to planets, like gravitational instabilities or regions where dust grains are trapped. The edge-on view of IRAS 04302’s disc shows instead the vertical structure, including how thick the dusty disk is. Dust grains migrate to the midplane of the disc, settle there and form a thin, dense layer that is conducive to planet formation; the thickness of the disc is a measure of how efficient this process has been.
The dense streak of dusty gas that runs vertically across this image cocoons IRAS 04302, blotting out its bright light such that Webb can more easily image the delicate structures around it. As a result, we’re treated to the sight of two gauzy nebulas on either side of the disc. These are reflection nebulas, illuminated by light from the central protostar reflecting off of the nebular material. Given the appearance of the two reflection nebulas, IRAS 04302 has been nicknamed the ‘Butterfly Star’.
At 7:05 a.m. EDT, the SpaceX Dragon spacecraft docked to the forward port of the International Space Station’s Harmony module. The spacecraft carried over 5,000 pounds of scientific investigations and cargo to the orbiting laboratory on SpaceX’s 33rd commercial resupply services mission for NASA. The mission launched at 2:45 a.m. on Aug. 24 atop a SpaceX Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida.
Longtime readers will recognize the name Dean Regas, astronomy contributor to The Enquirer and former cohost of the PBS series “Star Gazers,” but they may not know that Regas is also the author of seven books about astronomy. His latest foray into the world of writing, “All About Orion,” is a children’s book focused on its namesake, Orion, with a twist: the book features braille writing and textile constellations as well as large print for blind and visually impaired children.
The JWST’s latest exoplanet atmosphere target is GJ 3929 b. Astronomers discovered it in TESS data in 2022. “Our analysis confirms the planetary nature of the transiting planet GJ 3929 b,” the authors of the 2022 paper wrote. “Its mass and radius (~ 0.43 Earth masses and ~1.15 Earth radii) put it into the regime of small Earth-sized planets.” Earth-like planets attract attention for obvious reasons. Now the JWST’s results are in, and the once-promising planet appears to be barren.
Named S/2025 U1 for the time being, it is the 29th known moon of Uranus. It is also quite small, being only six miles in diameter. Even the Martian Deimos is 7.5 miles in diameter.
Given the names of the other local moons, such as Puck, Cupid, Ophelia, and Juliet, one can guess that a few astronomers are brushing up on their Shakespeare at the moment. However, the International Astronomical Union will have the final say.
It’s just nice to have something simple to acknowledge in the space realm given all the politics mucking things up here on Earth. We all need to look up from the news once in a while to appreciate the bigger picture.
Our Awesome Universe 