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another world would be designed specifically so it could
r r r a u
Our First Space Station
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acceleration altitude antenna apogee Apollo astronauts atmosphere atoms burn cargo bay carried colony combustion cosmic rays Courtesy of NASA crew difﬁcult Earth electric electromagnetic waves electrons elliptical energy Estes Industries external tank feet ﬁre ﬁrst ﬂight force fuel gases geosynchronous orbit gravity ground trace habitat heat Hubble Space Telescope human hydrogen infrared Landsat launch light liquid low Earth orbit lunar magnetic ﬁeld manipulator arm Mars Martian mass mass driver meteoroids miles per hour million missile module molecules Moon motion move nitrogen nuclear object oxygen particles payload percent perigee planet pounds pressure problem propellant protons radiation radio rocket engine rotating satellite sensors shown in Figure Skylab soil solar cells Solar System solar wind solid rocket boosters Soviet Space Shuttle space station space suit Space Telescope spacecraft spaceflight speed stars sunspot surface temperature thrust thrusters trajectory ultraviolet vehicle Voyager wavelengths weapons weightless x-rays zero