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Northrop Grumman's Cygnus XL Cargo Spacecraft Arrives At The ISS
September 19, 2025
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Northrop Grumman's largest cargo spacecraft, the Cygnus XL, successfully arrived at the International Space Station (ISS) on Thursday, Sept. 18 at 1124 UTC, after a one-day delay due to a thruster issue that required trajectory replanning.

NASA astronaut Jonny Kim and Zena Cardman used the orbiting lab's Canadarm2 robotic arm to grapple the Cygnus XL as the ISS flew about 420 kilometers above the Democratic Republic of Congo. The spacecraft was berthed to the Unity module's Earth-facing port at 1410 UTC.

The spacecraft, named S.S. William "Willie" McCool in honor of a NASA astronaut who died in the 2003 Columbia disaster, delivered approximately 4,990 kg of supplies, science experiments, and equipment to sustain the ISS crew and support critical research.

The NG-23 mission marks the debut flight of the Cygnus XL, a significantly upgraded version of Northrop Grumman's cargo ship with 33% more cargo capacity than previous models. This increased capacity, achieved through a 1.6-meter longer pressurized cargo module, allows the spacecraft to carry the equivalent volume of two-and-a-half minivans. It is the first Cygnus delivery to the ISS in over a year, following delays caused by issues with the NG-22 mission, which was ultimately canceled after its spacecraft was damaged during transport.

The Cygnus XL launched on Sunday, September 14, 2025, atop a SpaceX Falcon 9 rocket from Cape Canaveral Space Force Station, Florida.

NG-23 was the third and final Falcon 9 launch contracted by Northrop Grumman for its Cygnus missions, as the company transitions to a new, domestically built Antares 330 rocket, expected to debut in late 2026. The Falcon 9's higher payload capacity was crucial for maximizing the Cygnus XL's cargo potential.

The delivered cargo includes food, spare parts for life support systems like the urine processor, nitrogen, and oxygen  Key research payloads involve materials to produce semiconductor crystals in space, equipment to improve cryogenic fuel tanks, a specialized UV light system to prevent microbial growth in water systems, and pharmaceutical crystals for potential cancer treatments.

"Highlights of space station research and technology demonstrations, facilitated by delivery aboard this Cygnus XL, include materials to produce semiconductor crystals in space and equipment to develop improvements for cryogenic fuel tanks," agency officials wrote in a mission description. "The spacecraft also will deliver a specialized UV light system to prevent the growth of microbe communities that form in water systems and supplies to produce pharmaceutical crystals that could treat cancer and other diseases."

The Cygnus XL was supposed to reach the ISS on Wednesday morning (Sept. 17), but that plan was scuttled by a thruster issue. The Cygnus team overcame that problem, however, and got the freighter on track for a one-day-late rendezvous.

"It's a very intricate planning exercise that we have to go through to arrive at Space Station and rendezvous in a very specific point in space," Bill Spetch, NASA ISS operations integration manager, during the Thursday morning docking broadcast. "When we had a couple of issues with a couple of burns getting cut short, that caused that trajectory to be off, and so it takes some time to go replan that and make sure that we could arrive at station safely."

The NG-23 Cygnus XL honors a fallen NASA astronaut. The freighter is named the S.S. William "Willie" McCool, after one of the seven crew members who died in the 2003 space shuttle Columbia accident.

"His life continues to inspire us." Kim said after spacecraft capture. "To see a ship bearing his name safely arrive at the station is a reminder that his courage and kindness are still circling our beautiful planet Earth."

Cygnus XL will remain docked until March 2026, during which time it will be filled with waste before departing and deorbiting to burn up in Earth's atmosphere. This mission is part of Northrop Grumman's ongoing NASA Commercial Resupply Services contract, with three more missions already on the books.

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SpaceX Falcon 9 launched Northrop Grumman's new Cygnus XL cargo spacecraft on its debut mission NG-23, to the International Space Station (ISS) on Sunday, Sept. 14, at 2211 UTC from Cape Canaveral Space Force Station's Space Launch Complex 40.

The Falcon 9 rocket's first-stage booster B1094 which is on its fourth flight, successfully returned to Landing Zone 2 at Cape Canaveral about eight minutes after liftoff as planned. Meanwhile Cygnus XL separated from the Falcon 9 second stage in orbit about 15 minutes after liftoff, on its way to the space station.

"@NorthropGrumman's Cygnus XL cargo craft deployed its cymbal-shaped UltraFlex solar arrays about an hour-and-a-half after launch today powering the spacecraft during its flight to the station," NASA ISS page wrote on X.

The NG-23 mission marks the first flight of the Cygnus XL, a significantly larger and more capable freighter capable of carrying 4,990 kilograms(kg) of cargo, a 33% increase over previous models. The previous iteration hauled about 3,855 kg pounds of cargo to the ISS.

The spacecraft, named S.S. William "Willie" McCool in honor of the Columbia STS-107 pilot, will be captured by the station's Canadarm2 robotic arm and berthed to the Unity module on Wednesday, September 17, 2025 at about 1035 UTC.

NG-23 is Northrop Grumman's 23rd resupply mission to the ISS under NASA's Commercial Resupply Services-2 contract. The Cygnus XL's increased capacity allows for more science and cargo delivery, including materials for semiconductor and pharmaceutical crystal production, equipment for cryogenic fuel tank improvements, and a specialized UV light system to combat microbial growth in the station's water systems.

Among the supplies packed aboard the freighter are "materials to produce semiconductor crystals in space and equipment to develop improvements for cryogenic fuel tanks," NASA officials wrote in a statement. "The spacecraft also will deliver a specialized UV light system to prevent the growth of microbe communities that form in water systems and supplies to produce pharmaceutical crystals that could treat cancer and other diseases."

The spacecraft will remain docked to the ISS until at least March 2026, after which it will be filled with waste and deorbited to burn up in Earth's atmosphere. Unlike SpaceX's reusable Dragon capsule, Cygnus is a disposable spacecraft.

The Cygnus XL's larger size necessitates temporary unberthing from the ISS during the approach of a crewed Russian Soyuz spacecraft in November 2025 for safety reasons.

NG-23 is the first Cygnus launch since August 2024, when NG-21 took flight. NG-22 was supposed to follow in January of this year but was delayed to June due to avionics issues. Then, in late March, NASA announced that NG-22 had been called off, as a result of damage the Cygnus incurred during transport to the launch site.

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Iran Issues Sweeping Demands Before It Opens Strait Of Hormuz: US Must 'Correct Its Behavior'

Iran’s Supreme National Security Council (SNSC), led by Secretary Mohammad Bagher Zolghadr, on Saturday, issued a sweeping list of demands declaring that the Strait of Hormuz will not reopen until the United States "corrects its behavior."

These demands, published by Iranian state media, include permanently ending threats and hostilities against Iran and its regional allies, withdrawing all U.S. military forces from the region, lifting the naval blockade and sanctions, paying full war reparations, and unconditionally releasing frozen Iranian assets.

Iran effectively closed the Strait in retaliation for attacks by the U.S. and Israel, halting critical maritime trade and causing global energy prices to spike, with U.S. gas prices averaging $4.02. A temporary ceasefire memorandum signed in June collapsed over U.S. military interference. Tehran claims that after shipping restored to roughly 60% of pre-war capacity, the U.S. sought to establish unauthorized alternative routes and challenge Iranian management of the channel.

Iranian military continue to 'violating' vessels—including a Saturday Iranian missile strike on an Emirati-flagged tanker—underscoring the volatile environment surrounding the Strait of Hormuz through which roughly 20% of the world’s petroleum and natural gas normally flows.

SNSC's stated conditions include,

  1. A permanent cessation of U.S. threats and military actions directed at Iran probably directed at President Donald Trump who regularly threatens the Iranian government in apocalyptic terms.

  2. An immediate end to strikes and offensive military operations targeting Iran's allies across Lebanon, Palestine, Yemen, and Iraq.

  3. Complete termination of the U.S. naval blockade restricting Iranian ports.

  4. Full pullout of U.S. naval and air forces deployed in the immediate vicinity of Iran.

  5. Financial compensation paid by Washington for damages inflicted during the war.

  6. Complete lifting of economic sanctions and the immediate release of frozen Iranian assets abroad.

"Until America corrects its behavior, the Strait of Hormuz will not open," Zolghadr declared, emphasizing that Tehran views control over the waterway not merely as an economic mechanism, but as a core pillar of its geographic and strategic power.

Meanwhile, Iranian Foreign Minister Abbas Araghchi said Saturday, that negotiations with Oman are in the "final stages" and close to an agreement on managing shipping traffic, specifically regarding the determination of new transit routes.

Araghchi noted that the historical Traffic Separation Scheme (TSS) in the strait is no longer acceptable to Tehran. Iranian and Omani naval delegations have drafted maps for a temporary route along Oman's coast to serve as a bridge toward a permanent framework.

However, Araghchi cautioned that this bilateral deal alone is insufficient; the full reopening of the waterway remains contingent on the U.S. meeting Tehran’s conditions, which he attributed to Washington's alleged violation of the interim ceasefire memorandum signed in June.

Oman described talks as "positive and constructive" but warned that ongoing attacks on commercial vessels, such as the recent missile strike on UAE-owned ship, could derail progress.

The Trump administration has insisted on the complete, unhindered reopening of the Strait and rejected Iran’s attempts to charge transit fees or exercise unilateral control, viewing the Iranian demands as unlikely to be agreed upon.

While U.S. officials expressed optimism over a potential 30- to 60-day maritime truce, they warned that sanctions relief and unfreezing assets remain strictly tied to a broader peace agreement and nuclear compliance.

Zolghadr’s public hardline stance Saturday, follows unconfirmed reports of internal debates within Tehran. Reformist President Masoud Pezeshkian had supported the Omani diplomatic track to resolve the crisis and end economic isolation. However, hardline factions led by Zolghadr and Islamic Revolutionary Guard Corps (IRGC) commanders insist that the strait remain closed as leverage against U.S. pressure.

U.S. Vice President JD Vance told Fox News on Saturday: "We're talking to the Iranians, of course. We're trying to maximize the amount of oil and gas that is coming out of the Strait of Hormuz. We're just trying to make sure that we get what we need out of this particular conflict.

"We've destroyed their nuclear program, we've destroyed their conventional military, we've radically reduced their asymmetric military abilities, and right now, we're trying to see if they're willing to make the kind of long-term changes that would be necessary to have a better relationship with the United States—and if not, that's fine too. We're just going to keep on applying the pressure that we can apply and getting as much oil and gas out of the Middle East so that Americans can enjoy lower gas and energy prices."

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Top US General Urges Trump To Seek Off-ramp From Iran War, Warns Escalation Risks Backfiring

General Dan Caine, Chairman of the Joint Chiefs of Staff, is reportedly privately seeking an "off-ramp" from the war with Iran, arguing that U.S. airpower alone cannot achieve President Donald Trump's objectives and that further escalation risks backfiring due to depleted munitions stockpiles, and the high probability of Iranian retaliation against U.S. forces and regional allies.

Caine reportedly coordinated with Vice President JD Vance, Secretary of State Marco Rubio, and CIA Director John Ratcliffe to present a unified view to Trump in a recent meeting, that the military conflict has reached a crossroads, prompting the administration to focus on a diplomatic solution that offers the president a "symbolic" win.

In a statement to CNN, a spokesperson for Caine said, “General Caine is an incredible asset to President Trump’s national security team, and the overwhelming success of Operations Epic Fury, Midnight Hammer, and Absolute Resolve speaks for itself.”

Caine and other administration officials were skeptical of a series of U.S. strikes on Iran late last month, where the U.S. bombed the country for at least 12 straight days.

“The only ones in favor of the operation were elements of CENTCOM,” a U.S. official reportedly said, noting that Israel also supported the effort to escalate hostilities. Eventually, the U.S. eased up on the strikes after Middle East allies told Trump the bombings were endangering the region.

In meetings with the president, Caine has made clear the potential downsides of continued U.S. actions in Iran, but he also reassured Trump that “we could absolutely wreck” the Iranians if he would like to proceed.

This push for disengagement comes as Iran and Oman finalize a deal to reopen the Strait of Hormuz, a strategic waterway Iran has restricted since the war began in February 2026. The Trump administration aims to transition from a military stalemate to a diplomatic breakthrough, using the reopening of the Strait as a tangible victory to justify ending the conflict to the American public.

The proposed Iran-Oman agreement establishes temporary inbound and outbound shipping lanes and sets a 60-day period for further negotiations, with the U.S. pledging to lift its blockade on Iranian ports once the deal is implemented. Under the plan, commercial vessels would enter the Persian Gulf via an Iranian-controlled route and exit through an Omani-controlled route.

The negotiations have resulted in broad agreement on a new transit framework, which Trump said on Friday,, could be announced "soon" as a pathway to ending hostilities.

The conflict, launched via Operation Epic Fury in February 28, has dragged on for nearly six months with no clear military resolution; ground invasion is rejected by Trump, while airstrikes have failed to force a favorable deal.

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Spacewalk 96: Astronauts Prep ISS Power Infrastructure For Solar Array Upgrade

Anil Menon and Jessica Meir completed a 6 hours 27 minutes U.S. Spacewalk 96 or extravehicular activity (EVA) on Thursday (Aug. 6). The NASA astronauts exited the International Space Station (ISS)’s Quest airlock to modify the 3B power channel on the Starboard 6 truss, preparing the station for the installation of a seventh ISS Roll-Out Solar Array (IROSA) later in the year.

Since 2021, astronauts on prior spacewalks have deployed six of the iROSA assemblies, leaving now just two awaiting delivery to the station later this year. The ISS relies on eight individual power channels fed by primary solar array wings deployed between 2000 and 2009. Over decades in low Earth orbit, radiation and thermal cycling gradually reduced the efficiency of these original arrays.

Thursday's spacewalk began at 1233 UTC when the astronauts switched their spacesuits to internal battery power. A veteran astronaut, Meir served as EV-1 and wore a spacesuit with red stripes; this is her sixth spacewalk since her first ISS mission between 2019 and 2020. Menon, a U.S. Space Force colonel and physician, is on his first mission to space and wore an unmarked spacesuit as EV-2.

Meir and Menon assembled the modification kit for one of the space station's eight power channels, which will allow for the future addition of a new iROSA. They worked to assemble and bolt together the triangular brackets on the 3B power channel, located on the far right, or starboard (S6) segment of the station's backbone truss.

Menon was positioned on an articulating portable foot restraint (APFR) atop a worksite interface (WIFEX), providing a stable angle to work from the truss.

Once the modification kit structure was built and secured to the 3B mast canister, the two spacewalkers routed cabling that will carry the electricity from the future iROSA into the 3B power channel and then covered the struts with multi-layer insulation to protect them from micrometeoroid strikes.

The iROSA wings sit forward of the legacy solar arrays, augmenting their electricity generation rather than replacing it. The station's eight original arrays began showing degraded power output as they exceeded their 15-year design life. When used in tandem with the new iROSA wings, the upgraded system will increase the station's electricity supply by 20% to 30%.

The other power channel currently without an iROSA deployed is 2A on the left, or port side, of the station.

"Anil, you can see the moon to the — well, I am not sure what way you're facing, but…," said Meir, taking a short break during the spacewalk to notice NASA's next destination for astronauts under its Artemis program.

"To my right. Yeah, I see it — thanks for the heads-up," said Menon. "I can see a future moon base there."

"I can see it, too!" Meir said.

Meir later turned her attention to Mars with her closing words of the day.

"On this day in 2012, NASA's robotic rover Curiosity successfully landed on the surface of Mars with the goal of understanding if the planet could have fostered life. Curiosity achieved that goal within a year," she said. "One day, humans will visit Curiosity, propelled by the groundbreaking science, technology demonstrations and operations conducted here on the International Space Station for almost 26 years now."

"Today, we made one more step toward expanding the ISS power system, further sustaining our human presence in low Earth orbit, as we prepare to take those next steps," said Meir.

Meir and Menon upgraded the ISS power infrastructure to support critical operations, including life support and scientific experiments, as the station ages. This upgrade is critical for sustaining the station’s power margin through its planned controlled deorbit in late 2030, requiring additional energy for attitude control and avionics during reentry.

After collecting their tools and reentering the Quest airlock, the spacewalk concluded at 1900 UTC.

This was the first spacewalk for the space station's Expedition 75 crew; the 96th U.S. EVA and 281st spacewalk overall in support of the space station's assembly, maintenance and enhancement.

There are two more U.S. spacewalks scheduled for this month: EVA 97 will work to replace a space-to-ground antenna on Aug. 13, and EVA 98 will connect power channel cables and data relay systems as part of ongoing maintenance, including preparations for the station's future deorbit, as well as replace a navigational aid used for spacecraft docking on Aug. 25.

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