Ars Technica: In response to its lawsuit against the US Air Force’s contract with United Launch Alliance, on 30 April SpaceX received an injunction against ULA’s purchase of engines from the Russian company NGO Energomash. On 8 May the court dismissed the injunction in response to receiving documents and statements from the Departments of State, Treasury, and Commerce. SpaceX had argued that because NGO Energomash is state owned, purchases of its RD-180 engines could be considered payments to Dmitry Rogozin, the head of the Russian space program. Rogozin is one of the people included in the sanctions in Executive Order 13 661—issued in response to the Russia–Ukraine crisis—so such purchases would seem to violate the order. The court decided that because the government agencies did not currently view the sanctions as applying in that manner, it could not continue the injunction.
The finding that the Saturnian moon may host layers of icy slush instead of a global ocean could change how planetary scientists think about other icy moons as well.
Modeling the shapes of tree branches, neurons, and blood vessels is a thorny problem, but researchers have just discovered that much of the math has already been done.
January 29, 2026 12:52 PM
Get PT in your inbox
PT The Week in Physics
A collection of PT's content from the previous week delivered every Monday.
One email per week
PT New Issue Alert
Be notified about the new issue with links to highlights and the full TOC.
One email per month
PT Webinars & White Papers
The latest webinars, white papers and other informational resources.