Month: September 2024

Enlarge / Artist's conception of a dark matter filament containing a galaxy with large jets. (Caltech noted that some details of this image were created using AI.) (credit: Martijn Oei (Caltech) / Dylan Nelson (IllustrisTNG Collaboration).)

The supermassive black holes that sit at the center of galaxies aren't just decorative. The intense radiation they emit when feeding helps drive away gas and dust that would otherwise form stars, providing feedback that limits the growth of the galaxy. But their influence may extend beyond the galaxy they inhabit. Many black holes produce jets and, in the case of supermassive versions, these jets can eject material entirely out of the galaxy.

Now, researchers are getting a clearer picture of just how far outside of the galaxy their influence can reach. A new study describes the largest ever jets observed, extending across a total distance of 23 million light-years (seven megaparsecs). At those distances, the jets could easily send material into other galaxies and across the cosmic web of dark matter that structures the Universe.

Extreme jets

Jets are formed in the complex environment near a black hole. The intense heating of infalling material ionizes and heats it, creating electromagnetic fields that act as a natural particle accelerator. This creates jets of particles that travel at a substantial fraction of the speed of light. These will ultimately slam into nearby material, creating shockwaves that heat and accelerate that, too. Over time, this leads to large-scale, coordinated outflows of material, with the scale of the jet being proportional to a combination of the size of the black hole and the amount of material it is feeding on.

Enlarge / The Kalalau Valley between sheer cliffs in the Na Pali Coast State Park on the western shore of the island of Kauai in Hawaii, United States. This view is from the Pihea Trail in the Kokee State Park. (credit: Getty | Jon G. Fuller)

The Hawaiian island of Kauai may not have any spewing lava, but hikers along the magnificent Napali coast have brought their own volcanic action recently, violently hollowing their innards amid the gushing waterfalls and deeply carved valleys.

Between August and early September, at least 50 hikers fell ill with norovirus along the famed Kalalau Trail, which has been closed since September 4 for a deep cleaning. The rugged 11-mile trail runs along the northwest coast of the island, giving adventurers breathtaking views of stunning sea cliffs and Kauai's lush valleys. It's situated just north of Waimea Canyon State Park, also known as the Grand Canyon of the Pacific.

"It’s one of the most beautiful places in the world. I feel really fortunate to be able to be there, and appreciate and respect that land,” one hiker who fell ill in late August told The Washington Post. "My guts exploding all over that land was not what I wanted to do at all."

Enlarge / NASA officials inside SpaceX's launch control center at Hangar X watch the liftoff of a Falcon 9 rocket a few miles away on March 3, 2024. (credit: NASA/Aubrey Gemignani)

The Federal Aviation Administration alleged Tuesday that SpaceX violated its launch license requirements on two occasions last year by using an unauthorized launch control center and fuel farm at NASA's Kennedy Space Center in Florida.

The regulator seeks to fine SpaceX $633,009 for the alleged violations, which occurred during a Falcon 9 launch and a Falcon Heavy launch last year. Combined, the proposed fines make up the largest civil penalty ever imposed by the FAA's commercial spaceflight division.

“Safety drives everything we do at the FAA, including a legal responsibility for the safety oversight of companies with commercial space transportation licenses,” said Marc Nichols, the FAA's chief counsel, in a statement. “Failure of a company to comply with the safety requirements will result in consequences.”

Enlarge / The iPhone 16. (credit: Apple)

If you've ever had an iPhone update go bad, you may have used recovery mode to resuscitate your device. A device booted into recovery mode can't do anything by itself, but it can be connected to a working Mac or PC with a cable, and that Mac or PC can download a fresh copy of iOS and all of your phone's related firmware to restore it to a factory-default state. You'll need a backup to recover your personal data, but it beats having to take a trip to an Apple Store or send your phone in for repairs.

The new iPhone 16 and 16 Pro models launching this week apparently add a new option for phones that are in recovery mode: rudimentary wireless communication, so phones that need to be recovered can be placed near another iPhone or an iPad and be restored without using a cable, a PC, or Mac.

The new system was tested by 9to5Mac, which says it uses "the same RecoveryOS that lets users restore Apple Watch and Apple TV firmware from an iPhone." When you place an iPhone 16 in recovery mode near another device, the functioning device will download the software and firmware files and then transfer them to the broken phone, where they can be installed.