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For more information, contact Jonathan E. Jones, Langley Research Center, [email protected] 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. … Read more

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 Science … Read more

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 A … Read more

Earth Observatory Science Earth Observatory Boom Year for Desert Blooms Earth Earth Observatory Image of the Day EO Explorer Topics All Topics Atmosphere Land Heat & Radiation Life on Earth Human Dimensions Natural Events Oceans Remote Sensing Technology Snow & Ice Water More Content Collections Global Maps World of Change Articles Earth Matters Blog Blue … Read more

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 5010-5015: … Read more

APOD Science APOD APOD: 2026 September 22 –… 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. Chance Triple Alignment: … Read more

3 Min Read Embracing the Equinox Illustration showing how Earth’s tilt leads to the Northern and Southern Hemispheres receiving changing amounts of sunlight over the course of the year. At the equinoxes, neither hemisphere is more tilted toward the Sun, so both hemispheres receive the same amount of sunlight. Credits: NASA/JPL-Caltech Depending on your locale, … Read more

U.S. Deputy Assistant Secretary of State for Space and Environment Connor Tomlinson, left, NASA Deputy Administrator Matt Anderson, Albania’s Minister for Europe and Foreign Affairs Ferit Hoxha, and Ambassador of the Republic of Albania to the United States Ervin Bushati, right, are seen at the conclusion of an Artemis Accords signing ceremony Monday, September 21, … Read more

NASA kicked off its State Hubs for Skilled Technical Workforce initiative Sept. 15, 2026 with awardees at Space Center Houston. Agency leadership convened State Hub partners to align strategy and build momentum while focusing on partnerships, small business engagement, and next steps. Elaine Ho, associate administrator for NASA’s Office of STEM Engagement in Washington, addresses … Read more

Earth Observatory Science Earth Observatory An Epic View of the Seasons Earth Earth Observatory Image of the Day EO Explorer Topics All Topics Atmosphere Land Heat & Radiation Life on Earth Human Dimensions Natural Events Oceans Remote Sensing Technology Snow & Ice Water More Content Collections Global Maps World of Change Articles Earth Matters Blog … Read more