During a four-hour, 54-minute spacewalk on July 27, astronauts Tom Marshburn (left) and Christopher Cassidy secured multi-layer insulation around the Special Purpose Dexterous Manipulator arm known as Dextre, worked on power channels for two space station gyroscopes, installed video cameras on the front and back of the new Japanese Exposed Facility (also known as “the porch”) and worked on other tasks, including tying down cables and installing handrails and a portable foot restraint to aid future spacewalkers The Japanese Experiment Module – Exposed Facility, also known as “the porch,” is seen from inside the module, which is attached to the International Space Station. The experiment unit, called Kibo — Japanese for Another view of the Japanese Experiment Module – Exposed Facility, seen from inside the Kibo module on Flight Day 11, or July 25 One of two Russian Soyuz spacecraft docked at the International Space Station, photographed July 22 by a crew member against the backdrop of Earth 350 kilometres below Another view, taken July 22, of one of the two Russian Soyuz spacecraft docked to the International Space Station

NASA:

The analysis of Apophis previews situations likely to be encountered with NEAs yet to be discovered: a close approach that is not dangerous (like Apophis in 2029) nonetheless close enough to obscure the proximity and the danger of a later approach (like Apophis in 2036) by amplifying trajectory prediction uncertainties caused by difficult-to-observe physical characteristics interacting with solar radiation as well as other factors.

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