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#astronaut

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grobi

From Wikipedia, the free encyclopedia

Extravehicular activity (EVA)

is any activity done by an #astronaut in outer space outside a spacecraft. In the absence of a breathable Earthlike atmosphere, the astronaut is completely reliant on a #space suit for environmental support. EVA includes spacewalks and lunar or planetary surface exploration (commonly known from 1969 to 1972 as moonwalks). In a stand-up EVA (SEVA), an astronaut stands through an open hatch but does not fully leave the spacecraft. EVAs have been conducted by the Soviet Union/Russia, the United States, and China; astronauts from Canada, Japan, Brazil, the United Arab Emirates, and the European Space Agency have also participated in EVAs conducted by those nations.

On March 18, 1965, Alexei Leonov became the first human to perform a #spacewalk exiting the Voskhod 2 capsule for 12 minutes and 9 seconds. On July 20, 1969, Neil Armstrong became the first human to perform a moonwalk, outside his lunar lander on Apollo 11 for 2 hours and 31 minutes. In 1984, Svetlana Savitskaya became the first woman to perform a spacewalk, conducting EVA outside the Salyut 7 space station for 3 hours and 35 minutes. On the last three Moon missions, astronauts also performed deep-space EVAs on the return to Earth, to retrieve film canisters from the outside of the spacecraft. American Astronauts Pete Conrad, Joseph Kerwin, and Paul Weitz also used EVA in 1973 to repair launch damage to Skylab, the United States' first space station.

EVAs may be either tethered (the astronaut is connected to the spacecraft; oxygen and electrical power can be supplied through an umbilical cable; no propulsion is needed to return to the spacecraft), or untethered. Untethered spacewalks were only performed on three missions in 1984 using the Manned Maneuvering Unit (MMU), and on a flight test in 1994 of the Simplified Aid For EVA Rescue (SAFER), a safety device worn on tethered U.S. EVAs. [...]

#astrophotography#photography#science
Nicole Sharp

A Sprite From Orbit

A sprite, also known as a red sprite, is an upper-atmospheric electrical discharge sometimes seen from thunderstorms. Unlike lightning, sprites discharge upward from the storm toward the ionosphere. This particular one was captured by an astronaut aboard the International Space Station. That’s a pretty incredible feat because sprites typically only last a millisecond or so. The first one wasn’t photographed until 1989. (Image credit: NASA; via P. Byrne)

#astronaut#atmosphericScience#fluidDynamics
Benjamin Carr, Ph.D. 👨🏻‍💻🧬

#NASA veteran warns #Hubble faces death by a hundred cuts
Former #astronaut laments software shutdowns, staff reductions amid ongoing budget squeeze
Dr John Grunsfeld, former astronaut, NASA chief scientist, and retired associate administrator of NASA's Science Mission Directorate, was talking to The Register in the wake of the proposed cuts to NASA's budget and, in particular, the proposal to reduce the #space agency's #science budget by almost half.
theregister.com/2025/07/21/hub

The Register · NASA veteran warns Hubble faces death by a hundred cutsBy Richard Speed
Flipboard Science Desk

Marc Garneau, the first Canadian astronaut to go to space, has died at age 76. Garneau flew on three NASA Space Shuttle missions. He later became president of the Canadian Space Agency, then an MP and minister in Prime Minister Justin Trudeau's cabinet. Here's more from @GlobalNews .

flip.it/n8N6Tj

Global News · Marc Garneau, former astronaut and federal cabinet minister, dead at 76By Sean Boynton
#CanadianNews#Astronaut#MarcGarneau
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