Isar Aerospace still commands top position among a new generation of European rocket startups, but the company's efforts to launch a critical test flight of its Spectrum rocket continue to encounter roadblocks.

The latest delay came Monday, when Isar scrubbed a launch attempt after "detecting off nominal behavior in the vehicle's fluid systems," according to a social media post. "The teams are analyzing the new data to isolate the root cause."

The two-stage, 92-foot-tall (28-meter) Spectrum rocket was awaiting liftoff from Andøya Spaceport in northern Norway. It was the fourth time in five months that Isar Aerospace, headquartered near Munich, Germany, had reached a target launch date for the second test flight of the Spectrum launch vehicle.

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The upper stage from a commercial Chinese rocket that launched last week has broken apart in space, spreading debris in a heavily trafficked part of low-Earth orbit home to the International Space Station and a significant portion of SpaceX's Starlink broadband network.

The breakup occurred shortly after the Zhuque-2E rocket reached orbit on June 9 with two satellites providing direct-to-cell communications, perhaps around the time the upper stage was expected to perform a disposal burn. The US Space Force confirmed the breakup event in a post on space-track.org, a website used by the military to distribute orbit data to the public.

"The tracked pieces are being incorporated into routine conjunction assessment to support spaceflight safety," the Space Force wrote in an advisory. "There are currently no threats to human spaceflight. Analysis is ongoing."

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NASA pushed its Deep Space Network beyond its limits during the Artemis I mission nearly four years ago. The global array of deep space communications antennas couldn't keep up with the routine demands of 40 robotic science missions and the extraordinary surge required by NASA's Orion space capsule as it flew around the Moon.

The experience in late 2022 reduced or delayed downlinks from several high-profile science missions, including the James Webb Space Telescope and Mars rovers, as the data-hungry Artemis I mission took priority on NASA's communications network. And that was before the first Artemis mission with astronauts onboard. When Artemis II launched April 1, NASA called upon the Deep Space Network (DSN) again to connect Mission Control to the Orion capsule as it soared more than a quarter of a million miles from Earth.

With a crew of four flying inside the spacecraft, the agency's appetite for data from Orion on Artemis II was even higher than it was on Artemis I. But at a little more than nine days, the Artemis II mission was shorter than the 25 days Artemis I spent in space, helping alleviate the communications overload. Artemis I also launched 10 small CubeSats into deep space, many of which required tracking and telecom services from the DSN. Artemis II carried fewer CubeSats.

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The Federal Communications Commission has waived a requirement for Amazon to launch half of its satellite broadband constellation by the end of July, a key regulatory reprieve that buys the tech giant time to get more of its spacecraft into orbit.

Amazon won regulatory approval for the Amazon Leo network in July 2020. The FCC's authorization came with two deadlines. First, Amazon had to launch half of its 3,232 satellites by July 30, 2026, in order to maintain authorization to launch the rest of the network. The regulator gave Amazon a deadline of July 30, 2029, to have all of its first-generation satellites in orbit.

It has been apparent for some time that Amazon would not meet the FCC's requirement to launch half of its satellites—1,616 spacecraft—by the end of next month. Amazon filed an application in January requesting the FCC extend the deadline to July 2028 or waive it altogether. The commission decided on the latter option, removing any time limit for the 50 percent deployment milestone, but keeping the July 2029 deadline in place for the entire constellation.

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Five of the seven crew members on the International Space Station briefly sought refuge inside a SpaceX return capsule Friday morning as two Russian cosmonauts worked on an air leak on the other end of the complex.

NASA ordered US astronauts Jessica Meir and Jack Hathaway, French astronaut Sophie Adenot, and Russian cosmonaut Andrey Fedyaev into SpaceX's Crew Dragon Freedom spacecraft around 9 am EST (14:00 UTC) on Friday. The foursome launched aboard the SpaceX crew capsule on the Crew-12 mission in February, and the ship serves as their lifeboat until the crew's scheduled return to Earth in September.

NASA astronaut Chris Williams, who flew to the station in a Russian Soyuz ferry ship, joined the Crew-12 astronauts inside the Dragon spacecraft.

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Welcome to Edition 8.44 of the Rocket Report! The news this week is decidedly weighted in favor of heavy-lift rockets, largely due to the fallout from last Thursday's explosion of Blue Origin's New Glenn on its launch pad in Florida. Blue Origin aims to resume launches at the badly damaged launch facility by the end of the year, but there's good reason to be skeptical of this timeline. With New Glenn grounded, will Blue Origin founder Jeff Bezos approach Elon Musk's SpaceX to launch his Blue Moon lander to the lunar south pole? It sure sounds like NASA is pushing for that.

As always, we welcome reader submissions. If you don't want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets, as well as a quick look ahead at the next three launches on the calendar.

Spaceport development moves forward in Canada. There's been a lot of talk about the Canadian government's recent commitment to invest in a sovereign launch capability. There was the announcement last year of a federal budget of 182.6 million Canadian dollars ($131 million) over three years to establish a sovereign launch program. In March, the government said it would lease a dedicated launch pad at a commercially developed spaceport in Nova Scotia for national defense purposes, committing 200 million Canadian dollars ($144 million) to the deal. The agreement is a boon for Maritime Launch Services, which is developing Spaceport Nova Scotia after years of slow progress at the coastal site, SpaceQ reports.

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Last week's explosion of a New Glenn rocket at Cape Canaveral, Florida, was clearly a setback for Blue Origin and NASA, but it was a learning experience for safety officials looking to open up the spaceport to hundreds more launches per year.

The launch base on Florida's Space Coast is gearing up for a flurry of new arrivals. SpaceX is building multiple launch pads for its super-heavy Starship rocket, which will operate within a few miles of launch pads operated by SpaceX rivals Blue Origin and United Launch Alliance. Two other companies, Stoke Space and Relativity Space, are also developing launch sites along a narrow stretch of coastline at Cape Canaveral Space Force Station.

All of them have, or will soon have, rockets burning methane or liquified natural gas, replacing legacy launch vehicles fueled by kerosene, liquid hydrogen, or solid propellants. There are good technical reasons for making the switch, but until last week, engineers had scant real-world data on the damage that millions of pounds of methane and liquid oxygen would cause if a fully loaded rocket exploded on the launch pad or soon after liftoff.

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