ORIGINAL AB Emblem NASA - EVA SYSTEMS - VITRUVIAN MAN SHUTTLE SPACE PATCH

Description

ORIGINAL AB Emblem NASA - EVA SYSTEMS - VITRUVIAN MAN SHUTTLE SPACE PATCH
Extra-vehicular activity (EVA) is work done by an astronaut away from the Earth and outside of a spacecraft. The term most commonly applies to an EVA made outside a craft orbiting Earth (a spacewalk) but also applies to an EVA made on the surface of the Moon (a moonwalk). In the later lunar landing missions the command module pilot did an EVA to retrieve film canisters on the return trip.
Due to the different designs of the early spacecraft, the American and Soviet space programs also define an EVA differently. Russians define an EVA as occurring when a cosmonaut is in a vacuum. An American astronaut, in contrast, is not considered to have made an EVA until at least his head is outside the spacecraft. The term stand-up EVA (SEVA) is used for being partly outside.
EVAs may be either tethered (the astronaut is connected to the spacecraft, oxygen can be supplied through a tube, no propulsion is needed to return to the spacecraft) or untethered. When the tether performs life support functions such as providing oxygen, it is called an umbilical. For untethered EVAs during space flight, capability of returning to the spacecraft is essential
THIS ORIGINAL AB Emblem FULLY EMBROIDERED NASA PATCH IS 4 1/4" AND IS IN - MINT - CONDITION
THANKS FOR LOOKING, I WILL BE HAPPY TO COMBINE ITEMS TO SAVE ON SHIPPING
**** PLEASE CHECK OUT OUR -
EBAY STORE
- AND OTHER EBAY AUCTIONS
A LOT
MORE
GREAT PATCHES
,
CHALLENGE COINS,
FLOWN MEDALLIONS,
SPACE STICKERS AND INCREDIBLE
SIGNED NASA PHOTOS
NASA LITHOS AND
SPACE COLLECTIBLES
ARE LISTED
****PLEASE KEEP WATCHING, WE ARE ADDING NEW ITEMS DAILY****