For more information, contact Jonathan E. Jones, Langley Research Center, jonathan.e.jones@nasa.gov Download the PDF version The purpose of this Technical Bulletin is to communicate the risks associated with freeze–thaw cycles in hydrazine monopropellant systems and to provide general recommendations for mitigating damage, operational hazards, and loss of system reliability in propulsion and auxiliary hydrazine systems. [...]
Explore Hubble Hubble Home Overview About Hubble The History of Hubble Hubble Timeline Why Have a Telescope in Space? Hubble by the Numbers At the Museum FAQs Impact & Benefits Hubble’s Impact & Benefits Science Impacts Cultural Impact Technology Benefits Impact on Human Spaceflight Astro Community Impacts Science Hubble Science Science Themes Science Highlights [...]
APOD Science APOD APOD: 2026 September 23 – A… Today’s APOD Archive Submissions Index Search Calendar RSS Education About Discuss APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. AfterBefore [...]
Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Perseverance Rover Mars Curiosity Rover Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 3 min read Curiosity Blog, Sols [...]
The SpaceX Crew-13 members pose for a portrait in their pressure suits during a preflight training session at the company’s headquarters in Hawthorne, California. From left are, Roscosmos Sergey Teteryatnikov, NASA astronauts Jessica Watkins and Luke Delaney, and CSA (Canadian Space Agency) astronaut Joshua Kutryk. SpaceX NASA and SpaceX are targeting 11:10 a.m. EDT, Thursday, [...]
Photo of the Day This shot captured an unexpected silhouette. Which is it? It isn't the sunspots, the small dark regions caused by concentrated magnetic fields visible around the Sun's bright disk. Sunspots typically last for weeks and were expected, since these spots were seen previously. It isn’t the International Space Station (ISS), the [...]
3 min read Preparations for Next Moonwalk Simulations Underway (and Underwater) Top Row (from left to right): Michael Stenger, Joe Dervay, Steve Piper, Dave Francisco, Craig Kutz, Matthew Makowski, Alex Garbino, Hiroki Bochimoto, Doug Ebert, James Locke, Raffi Kuyumjian. Bottom Row (from left to right): Mark Crowther, Stephan Moll, Doug Ebersole, Mike Gernhardt, David Southerland, [...]
This long-duration image shows star trails above Earth, an aurora arcing across the atmosphere, and the city lights of Central Asia stretching below the International Space Station as it orbited 262 miles above Earth.NASA/Anil Menon Four Expedition 75 crewmates are preparing for their return to Earth aboard a SpaceX Dragon next month as their replacement [...]
6 min read NASA-Funded Research Finds Complex Life Defying Record Heat This video shows Incendiamoeba cascadensis motility at 60ºC. When pushed to its limits in the lab, I. cascadensis can remain partially active at 150.8 degrees Fahrenheit (66 degrees Celsius) and can recover from exposure to a staggering 158 degrees Fahrenheit (70 degrees Celsius) [...]
X-ray: NASA/CXC/Univ. of Alabama/M. Muhibullah et al.; Optical: NASA/ESA/STScI; Image Processing: NASA/CXC/SAO/N. Wolk Using NASA’s Chandra X-ray Observatory, researchers found mysterious objects that give off unusually low-energy X-rays but intense levels of ultraviolet radiation. One of the galaxies they studied, M101, is pictured here in this image released on Sept. 9, 2026. Astronomers suggest these [...]
