Uphill to Mars, Downhill to VenusA simple look at the possibility of space travel as well as some basic scientific principles. |
Contents
The Universe and the Planets | 3 |
The Size of Space | 16 |
The Space Between the Planets | 23 |
Copyright | |
12 other sections not shown
Common terms and phrases
aboard acceleration Alpha Centauri Apollo asteroid astronomers atmo back to earth ball balloon bouncing breathe climb command module craft crew members designed diameter distance earth and Mars earth orbit earth to Mars earth's atmosphere earth's gravity elliptical orbit empty energy equipment escape explore force of gravity fuel gases Gemini gravity hill heat high speed hundred miles inch Jupiter landing launching rocket lunar module lunar orbit Mercury meteor meteoroids miles per hour miles per second million miles mission molecules moon motion Mount Everest move needed nitrogen ocean oxygen parachutes particles photographs planet pounds pressure suit propellant reach reentry return to earth rocket engine rotating satellite Saturn scientists slow solar system solar wind space crews space flight space rocket space station space travelers spacecraft spaceship stars sun's gravity tanks telescope temperature things third stage tiny universe vehicle velocity weight weightlessness