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Science

NASA’s Hubble Seeks Lensed Supernova, Marks 200,000 Orbits

NASA’s Hubble Space Telescope completed its 200,000th orbit around Earth on Sept. 19, marking another new milestone for an observatory that continues to transform our understanding of the universe. Hubble has traveled more than 5 billion miles around Earth over its 36-year lifetime, exceeding 1.7 million total observations. An observation completed on the day of […]

Risk of Hydrazine Use Following Freeze–Thaw Exposure

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. […]

Shannon Lucid’s Record-Setting Mission Aboard Mir

Shannon Lucid’s Record-Setting Mission Aboard Mir Three days before returning to Earth, Shannon W. Lucid—who joined NASA in 1978 as one of its first six female astronauts—checked in on wheat growing in the Svet greenhouse aboard the Russian space station Mir. For six months, Lucid lived and worked alongside two Russian cosmonauts conducting life science […]

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Boom Year for Desert Blooms

Carpets of wildflowers burst from arid, ochre-colored land in Western Australia following winter rains.

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APOD: 2026 September 23 – A New Lunar Crater: McGetchin

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 […]