Astronaut White और Orange colors के spacesuit क्यों पहनते हैं | facts about space | space facts

KO_(2) finds use in oxygen cylinders used for space and submarines. The fact(s) related to such use of KO_(2) is /are :

An astronaut is looking down on earth's surface from a space shuttle at an altitude of 400 km. Assuming that the astronaut's pupil diameter is 5 mm and the wavelength of visible light is 500 nm. The astronaut will be able to resolve linear object of the size of about .

If you were to walk brieftly in space without a spacesuit while far from the Sun ( as an astronaut does in the movie 2001, A Space Odyssey ), you would feel the cold of space- while you radiated energy, you would absorb almost non from your environment . (a) At what rate would you lose energy ? (b) How much energy would you lose in 44s ? Assume that your emissivity is 0.90, and estimate other data needed in the calculations.