The gravitational field of the Moon has been measured by tracking the radio signals emitted by orbiting spacecraft. How did NASA know the gravity of the Moon? In fact, you'd need to be going very fast – more than 2 kilometres per second – to escape from the moon's surface. Could you jump off the Moon?Īlthough you can jump very high on the moon, you'll be happy to know that there's no need to worry about jumping all the way off into space. This structure is the main reason for this unique phenomenon where even the water is pushed upwards by the air. Does Moon have gravity?ġ.62 m/s²Moon / Gravity Why does Hoover Dam have no gravity?Īccording to reports, the structure of the dam creates such a hugely powerful updraft that the air pushes things back against gravity. The centre of the Earth is such that if we are at that place, the mass around us can be considered to be condensed at the surface of the Earth itself, i.e considering the Earth as a spherical shell. The correct answer is At the centre of the Earth. Gravity is everywhere in the universe and manifests itself in black holes, celestial orbits, ocean tides, and even our own weight. There is no such thing as zero gravity in space. As they orbit and fall toward Earth at the same rate as their spaceship, astronauts feel weightless, as if there were no gravity. In outer space, however, there is no ground to push against astronauts. On Earth, astronauts feel the force of gravity as weight, because Earth's surface prevents them from falling. Why can’t you pour water into the Hoover Dam?.How did NASA know the gravity of the Moon?.Is there actually zero gravity in space?.The authoritative record of NPR’s programming is the audio record. This text may not be in its final form and may be updated or revised in the future. NPR transcripts are created on a rush deadline by an NPR contractor. Visit our website terms of use and permissions pages at for further information. Nell Greenfieldboyce, NPR News.Ĭopyright © 2022 NPR. GREENFIELDBOYCE: All that reclaimed water is cleaned and recycled so that astronauts can drink it and sweat it out all over again. Of course, the other 50% is coming from urine. WILLIAMSON: That is about 50% of our water that we do reclaim. She says if you add up all the water that astronauts either sweat out or breathe out as moisture, it's about 1 1/2 liters per day per person. GREENFIELDBOYCE: Jill Williamson is NASA's water subsystems manager for the station. Otherwise, you know, you'll have a buildup of water condensing on all surfaces. JILL WILLIAMSON: We have to reclaim that water. So in the space station, any and all water in the air, like from sweat, has to get collected. GREENFIELDBOYCE: Electronics and water just don't get along. MASSIMINO: And we had some problems where sweat was getting - water was getting getting stuck in there and causing a problem with communication. Still, Massimino remembers one time when sweat got into the communications cap that's fitted out with headphones. Spacewalkers also wear sweat-absorbing fabrics like gloves and a sweat band around the head. GREENFIELDBOYCE: To deal with that heat, spacewalkers wear a special garment, basically long underwear that has tubes full of cooling water. And so you can build up a heavy heat load. They typically run about 6 1/2 hours, and you're moving that whole time typically. MASSIMINO: That's a real athletic event when you're spacewalking. GREENFIELDBOYCE: A towel works fine if you're inside the International Space Station, but if you go outside on a spacewalk. MASSIMINO: The water would just kind of form on your body and not go away necessarily unless you wiped it with a towel. So he says if you're on an exercise bike. GREENFIELDBOYCE: Instead, in microgravity, water tends to cling to whatever surface it's touching. MASSIMINO: Sweat does not fall off of your body, like, because there's no gravity there. He says in space, sweat won't drip off of you. GREENFIELDBOYCE: Mike Massimino is now a professor at Columbia University. MIKE MASSIMINO: I was exercising all the time I was an astronaut, it seemed like. NELL GREENFIELDBOYCE, BYLINE: Astronauts have to stay in shape both on the ground and once they're in orbit. Today we are leaving the planet to ponder sweating in space because, as NPR's Nell Greenfieldboyce reports, sweat is a big deal for space travelers. This summer, we have been examining sweat in a series of stories on all aspects of perspiration.
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