[:ja]【宇宙からの地球絶景】No.670: 船外活動[:en][Earthview Wonders] No.670: Extravehicular Activity (EVA)[:]

Sammy 2019/01/01

[:ja]明けましておめでとうございます。2019年初の投稿は、アレックス・ゲルスト宇宙飛行士がISSから撮影した船外活動（ExtraVehicular Activity, EVA）の様子です。

Credit: Alex Gerst, ESA, NASA

宇宙飛行士が宇宙船の外で行う活動、例えば装置や構造物の組み立てや修理、故障したり機能の低下した人工衛星の修理、科学機器の操作、サンプルの収集、写真撮影などの作業のことを、船外活動と呼んでおり、かつては宇宙遊泳（spacewalk）とも呼ばれていました。スペースシャトルでは初期のミッションにおいて、自由に移動噴射や姿勢制御ができる有人機動ユニット (MMU) を使用したことがあったが、実用的ではなかったため、使用されなくなりました。近年では、スペースシャトルや国際宇宙ステーション (ISS) のロボットアームの先端に足場を固定して行われる事が多くなっています。

参考文献： Alex Gerst’s Tweet
地球俯瞰画像を見る： LiVEARTH

[Earthview Wonders] No.670: Extravehicular Activity (EVA)

Happy New Year! The first earthview of 2019 is the extravehicular activity (EVA) of an astronaut captured by Alex Gerst on board ISS.

Credit: Alex Gerst, ESA, NASA

Extravehicular activity (EVA) is any activity done by an astronaut outside a spacecraft, or commonly known as spacewalk. 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.

Reference: Alex Gerst’s Tweet
See earthview photo gallery: LiVEARTH[:en][Earthview Wonders] No.670: Extravehicular Activity (EVA)

Happy New Year! The first earthview of 2019 is the extravehicular activity (EVA) of an astronaut captured by Alex Gerst on board ISS.

Credit: Alex Gerst, ESA, NASA

Extravehicular activity (EVA) is any activity done by an astronaut outside a spacecraft, or commonly known as spacewalk. 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.

Reference: Alex Gerst’s Tweet
See earthview photo gallery: LiVEARTH[:]