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Markús Þ. Þórhallsson

epa04709644 A handout picture made available by NASA on 18 April 2015 and taken by Italian Expedition 43 Flight Engineer Samantha Cristoforetti of the European Space Agency (ESA) on 12 February 2015, shows the giant solar arrays on the International Space Station (ISS). The space station's solar arrays contain a total of 262,400 solar cells and cover an area of about 2,500 square meters, more than half the area of a football field. A solar array's wingspan of 73 meters is longer than a Boeing 777's wingspan. Altogether, the four sets of arrays can generate 84 to 120 kilowatts of electricity -- enough to provide power to more than 40 average homes. The solar arrays produce more power than the station needs at one time for station systems and experiments. When the station is in sunlight, about 60 percent of the electricity that the solar arrays generate is used to charge the station's batteries. At times, some or all of the solar arrays are in the shadow of Earth or the shadow of part of the station. This means that those arrays are not collecting sunlight. The batteries power the station when it is not in the sun.  EPA/ESA / NASA / Samantha Cristoforetti  HANDOUT EDITORIAL USE ONLY

SPACE NASA ISS SOLAR

Ekki er enn vitað hvað veldur því að fljótandi ammoníak flæðir frá geimfari við Alþjóðlegu geimstöðina. Lekanum geta fylgt margvíslegar ógnir.

Fljótandi ammoníak flæðir frá geimfari við Alþjóðageimstöðina

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