Einstein didn't believe gravity was a force at all; he said it was a distortion in the shape of space-time, otherwise known as "the fourth dimension" (seeHow Special Relativity Worksto learn about space-time). Basic physics states that if there are no external forces at work, an object...
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In these space station concepts, people lived and worked in outer space. Most of the stations were wheel-like structures that rotated to provide artificial gravity. Like any port, ships traveled to and from the station. The ships carried cargo, passengers, and supplies from Earth. The departin...
Space junk got its start in the middle of the twentieth century, at the very beginning of the space race. When the Soviet Union launched Sputnik I, the firstsatellitein history to go into orbit around theEarth, on Oct. 4, 1957, the world paid attention. Although the satellite was small ...
In the zero-gravity environment of the ISS, the pieces need to be secured or they would float away, though lost pieces could usually be found relatively easily, not on a floor or under a couch as on Earth, but in the space station’s air filters....
Once aloft, gravity (the weight of the hang glider and pilot) pulls the glider back toward Earth and propels the glider forward, continually causing air to flow over the wing. In addition to the horizontal movement of air, hang gliders can get lift from rising currents of air, such as ...
So the air comes in the front of the motor here. It mixes with the fuel that we brought. And then it comes spewing out the back, pushes us along. And then the wings are just holding us up against gravity that's holding us down. But what do we do when we want to go this ...
A. It’s the first rice experiment in space. B. The gravity on Earth will influence the growing of the rice. C. It’s the first experiment to try to produce rice in a complete life cycle. D. If it works, the newly produced rice plant will be brought back to Earth. 4. What are...
四、阅读理解Have you ever thought about how astronauts wash their clothes without gravity? It's not easy.There's no washing machine on the International Space Station (ISS, 国际空间站). Luckily, this may not be a problem in the future.Russian scientists are making a special (特别的) washin...
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