Science: As NASA gears up for next week’s landing of the Curiosity rover on Mars, Science magazine interviews John Grunsfeld, the head of NASA’s Science Mission Directorate. A former astronaut, Grunsfeld took on the post in January. Despite the bad press NASA has received in recent years because of the canceling of the space shuttle program, the budget woes of the James Webb Space Telescope ( JWST), and the decision to pull out of the European-led ExoMars program, Grunsfeld remains optimistic about the future of US space exploration. He says the JWST is back on track, and he’s currently soliciting ideas for a future Mars program that would fly in 2018.
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.