S301 is the closest known star to the Milky Way's supermassive black hole. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. This visible light wide-field view shows the rich star clouds in the constellation of Sagittarius (the Archer) in the direction of the center of our Milky Way galaxy. Breakthroughs, discoveries, and DIY tips sent six days a week. By signing up, you confirm you are 16+, will receive newsletters and promotional content and agree to our Terms of Use and acknowledge the data practices in our Privacy Policy .

Versus Look Up Mashable's Best: E-readers, robovacs, laptops, earbuds, smart home and more Say More Creator Hub Gift Ideas For Everyone On Your List Mashable Selects Switch Off Trending Now Safety Net In My Bag VidCon with Mashable All Series What it actually is is weirder. Elisha Sauers writes about space for Mashable, taking deep dives into NASA's moon and Mars missions, chatting up astronauts and history-making discoverers, and jetting above the clouds . Through 17 years of reporting, she's covered a variety of topics, including health, business, and government, with a penchant for public records requests. She previously worked for in Norfolk, Virginia, and in Annapolis, Maryland. Her work has earned numerous state awards, including the Virginia Press Association's top honor, Best in Show, and national recognition for narrative storytelling.

Astronomers discover the existence of a'black hole star' The never-before-seen objects are gargantuan, immensely bright, and ancient. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. Astronomers have discovered a "black hole star," an extremely bright red spot in the early universe that appears to be a new type of astrophysical object. It resembles an enormous star, but its energy production is closer to what a black hole might generate. Breakthroughs, discoveries, and DIY tips sent six days a week.

Cosmic dust and water is withstanding radiation near the Milky Way galaxy's black hole, Saggitarius A*. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. This image features data from Webb's NIRCam (Near Infrared Camera) and MIRI (Mid Infrared Instrument) to capture the most detailed mid-infrared view yet of the field that hosts the highly evolved star IRS 3, which is located just 0.55 light-years from Sagittarius A*, the Milky Way galaxy's central supermassive black hole. An international team of astronomers have discovered that dust and water can form and survive surprisingly close to this supermassive black hole. Breakthroughs, discoveries, and DIY tips sent six days a week.

More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. These images show the evolution of supernova SN 2026gzf, which was first detected by the Einstein Probe on 21 March 2026. Images taken on 25 March and 3 April 2026 show the supernova brightening. An archival image of the host galaxy from 9 March 2016 reveals a bright blue source at the location of the supernova, which scientists say likely represents a compact, extreme star-forming region in the host galaxy, combined with pre-explosion activity of the progenitor star before its death. Breakthroughs, discoveries, and DIY tips sent six days a week.

Similar black holes are usually found at the center of a galaxy. This one is wandering the cosmos. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. This artist's concept depicts a tidal disruption event, which occurs when a star passes fatally close to a supermassive black hole. Crumbs of the splintering star heat up as they swirl around the black hole, creating a glow astronomers can see from far across the cosmos, and the black hole launches a relativistic jet into space.

The release also includes new sonifications of red, white, and blue nebulae and galaxies. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. In celebration of the 250th birthday of the United States, NASA's Chandra X-ray Observatory has unveiled four cosmic images rendered in red, white, and blue that represent the wonders of the universe that NASA explores. Breakthroughs, discoveries, and DIY tips sent six days a week. By signing up, you confirm you are 16+, will receive newsletters and promotional content and agree to our Terms of Use and acknowledge the data practices in our Privacy Policy .

Having defined and validated the pairwise feedback simulator and evaluations in AlpacaFarm, we569 now turn our attention to studying methods that learn from pairwise feedback on AlpacaFarm.570 Unfortunately, the lack of existing benchmarks for learning from pairwise feedback for instruction571 following means that there has not been any open study of these methods in the instruction-following572 setting. In the remainder of this section, we will introduce our reference methods, which fall into two575 categories based on whether they fit a surrogate reward model as part of the learning process.576 FeedME is a method proposed by OpenAI [45] that incorporates human feedback578 with supervised fine-tuning on model generations that are rated 7/7 by human labelers. We adapt579 this approach to the pairwise feedback setting and call this baseline binary FeedME. This approach580 fine-tunes the SFT model on the chosen response in each preference pair with supervised learning.581 Motivated by controllable generation through conditioning [27, 34,582 29, 21], we propose binary reward conditioning, a baseline method that fine-tunes the SFT model583 with the feedback data Dpairwise by conditioning instances with either a positive or negative control584 token. Specifically, for each instance (x,y0,y1,z) 2D pairwise, the string concatenation of instruction585 x and response yz denoted as [x,yz] is prepended with the positive token and used in supervised586 fine-tuning (similarly [x,y1 z]is prepended with the negative token). This process creates a modified587 demonstration dataset that is double the size of Dpairwise. At test time, we draw samples from the588 fine-tuned model conditioned on the positive token.589 A.2 Methods that optimize a surrogate reward function590 We now describe methods that incorporate feedback by first building a surrogate reward model with591 pairwise feedback data. To start, we describe the step of training the surrogate reward model.592 While this can be a powerful approach,596 we will see that it can also lead to over-optimization [19] where models learn to exploit the reward597 model rather than achieve high true reward. We now describe 4 methods that leverage the surrogate598 reward model.599

John Pendry is known for creating an invisibility cloak. John Pendry's kitchen is dominated by a huge photograph of what looks like the view through a kaleidoscope: dizzying shards of purple, green, yellow and white. Given that Pendry is famous above all else for inventing an invisibility cloak - a device that can bend light around objects - I wonder if I am looking at something related to that. But no, he tells me, the image simply shows crystals of vitamin C magnified many times. All that invisibility-cloak stuff is in the past, he says, and he has moved on to "more exciting things".

Science Space Deep Space Black Holes For the first time, astronomers witnessed the birth of a'magnetar' These fast spinning, magnetic neutron stars may power some of the brightest supernovae in the cosmos. Artist's conception of a magnetar surrounded by an accretion disk that is wobbling, or precessing, because of the effects of general relativity. Some models of magnetars suggest that high-speed jets of charged particles emanate from the magnetar along its rotation axis. Breakthroughs, discoveries, and DIY tips sent six days a week. In December 2024, astronomers watched a star around 25 times the mass of our sun die in a blaze of glory.