Enlarge / Holstein dairy cows in a freestall barn. (credit: Getty | )

The US Department of Agriculture this week posted an unpublished version of its genetic analysis into the spillover and spread of bird flu into US dairy cattle , offering the most complete look yet at the data state and federal investigators have amassed in the unexpected and worrisome outbreak—and what it might mean.

The preprint analysis provides several significant insights into the outbreak—from when it may have actually started, just how much transmission we're missing, stunning unknowns about the only human infection linked to the outbreak, and how much the virus continues to evolve in cows. The information is critical as flu experts fear the outbreak is heightening the ever-present risk that this wily flu virus will evolve to spread among humans and spark a pandemic.

But, the information hasn't been easy to come by. Since March 25—when the USDA confirmed for the first time that a herd of US dairy cows had contracted the highly pathogenic avian influenza H5N1 virus—the agency has garnered international criticism for not sharing data quickly or completely. On April 21, the agency dumped over 200 genetic sequences into public databases amid pressure from outside experts. However, many of those sequences lack descriptive metadata, which normally contains basic and key bits of information, like when and where the viral sample was taken. Outside experts don't have that crucial information, making independent analyses frustratingly limited. Thus, the new USDA analysis—which presumably includes that data—offers the best yet glimpse of the complete information on the outbreak.

Enlarge / A Long March 5 rocket carrying the Chang'e-6 lunar probe blasts off from the Wenchang Space Launch Center on May 3, 2024 in Wenchang, China. (credit: Li Zhenzhou/VCG via Getty Images)

China is going back to the Moon for more samples.

On Friday the country launched its largest rocket, the Long March 5, carrying an orbiter, lander, ascent vehicle, and a return spacecraft. The combined mass of the Chang'e-6 spacecraft is about 8 metric tons, and it will attempt to return rocks and soil from the far side of the Moon—something scientists have never been able to study before in-depth.

The mission's goal is to bring about 2 kg (4.4 pounds) of rocks back to Earth a little more than a month from now.

Enlarge / Mayans built impressive structures and occasionally put interesting items in the construction fill. (credit: Dr. Jürgen Tenckhoff )

As civilizations evolve, so do the political regimes that govern them. But the transition from one era to another is not always quiet. Some ancient Mayan rulers made a very fiery public statement about who was in charge.

When archaeologists dug up the burned fragments of royal bodies and artifacts at the Mayan archaeological site of Ucanal in Guatemala, they realized they were looking at the last remnants of a fallen regime. There was no scorching on the walls of the structure they were found beneath. This could have only meant that the remains (which had already been in their tombs a hundred years) were consumed by flames in one place and buried in another. But why?

The team of archaeologists, led by Christina T. Halperin of the University of Montreal, think this was the doing of a new leader who wanted to annihilate all traces of the old regime. He couldn’t just burn them. He also had to bury them where they would be forgotten.

Enlarge / The interior or the DIII-D tokamak. (credit: General Atomics )

Using nuclear fusion, the process that powers the stars, to produce electricity on Earth has famously been 30 years away for more than 70 years. But now, a breakthrough experiment done at the DIII-D National Fusion Facility in San Diego may finally push nuclear fusion power plants to be roughly 29 years away.

Nuclear fusion ceiling

The DIII-D facility is run by General Atomics for the Department of Energy. It includes an experimental tokamak, a donut-shaped nuclear fusion device that works by trapping astonishingly hot plasma in very strong, toroidal magnetic fields. Tokamaks, compared to other fusion reactor designs like stellarators, are the furthest along in their development; ITER, the world’s first power-plant-size fusion device now under construction in France, is scheduled to run its first tests with plasma in December 2025.

But tokamaks have always had some issues. Back in 1988, Martin Greenwald, a Massachusetts Institute of Technology expert on plasma physics, proposed an equation that described an apparent limit on how dense plasma could get in tokamaks. He argued that maximum attainable density is dictated by the minor radius of a tokamak and the current induced in the plasma to maintain magnetic stability. Going beyond that limit was supposed to make the magnets incapable of holding the plasma, heated up to north of 150 million degrees Celsius away from the walls of the machine.

Enlarge / This image captured by Astroscale's ADRAS-J satellite shows the discarded upper stage from a Japanese H-IIA rocket. (credit: Astroscale )

Welcome to Edition 6.42 of the Rocket Report! There are several major missions set for launch in the next few months. These include the first crew flight on Boeing's Starliner spacecraft, set for liftoff on May 6, and the next test flight of SpaceX's Starship rocket, which could happen before the end of May. Perhaps as soon as early summer, SpaceX could launch the Polaris Dawn mission with four private astronauts, who will perform the first fully commercial spacewalk in orbit. In June or July, Europe's new Ariane 6 rocket is slated to launch for the first time. Rest assured, Ars will have it all covered.

As always, we welcome reader submissions , and 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.

German rocket arrives at Scottish spaceport. Rocket Factory Augsburg has delivered a booster for its privately developed RFA One rocket to SaxaVord Spaceport in Scotland, the company announced on X . The first stage for the RFA One rocket was installed on its launch pad at SavaVord to undergo preparations for a static fire test. The booster arrived at the Scottish launch site with five of its kerosene-fueled Helix engines. The remaining four Helix engines, for a total of nine, will be fitted to the RFA One booster at SaxaVord, the company said.