In low Earth orbit there is no enough atmosphereto diffuse and scatter sunlight,so shadows are black an the sky isdark - even when the Sun shines.The harsh lighting produced thi dramatic effectas mission specialist Gregory Harbaughphotographed colleague Joseph Tanner duringtheir second spacewalk t service the HubbleSpace Telescope in February 1997.The aft section of th Space Shuttle Discovery isvisible in the background withthe Sun hanging over a delicate crescent o the Earth's limb.A checklist is attached to Tanner's left arm, andHarbaugh's reflectionis just visible in Tanner's visor.
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