The gravitational force is by far the weakest of the four forces of nature. It’s simple to defy gravity: just lift something in the air. But it’s both persistent and has an infinite range, which takes a surprising amount of work to overcome.
. It’s simple to defy gravity: just lift something in the air. But the annoying thing about gravity is that it’s both persistent and has an infinite range, which takes a surprising amount of work to overcome.be the weakest of all the forces. The whole mass of the Earth is pulling on you, but you can reach over and grab a pencil and overcome that entire gravitational might.
Going further, it’s not all that difficult to defy gravity and get into space. After all, the edge of space is just 100 kilometers away and shooting something straight up for that distance is not the hardest thing to do in the world. But gravity does have a superpower. Even at the edge of the atmosphere and the beginnings of space, Earth’s gravitational pull isn’t much weaker than what it is on the surface. So, unless you keep accelerating, eventually gravity will pull you back.in space. If you want to escape the gravitational clutches of the Earth altogether, you must achieve a speed of at least 11.2 kilometers per second, which is around 33 times the speed of sound.
All that technology still lies in the world of science fiction, but space agencies around the world are interested in developing such habitats for long-term missions in space.Speaking of science fiction, writers and authors love to come up with all sorts of gravity-defying gizmos, whether to provide artificial gravity for their ships or to propel their spacecraft through the universe. Unfortunately, it seems that these kinds of anti-gravity devices will remain in the realm of fiction.
However, at the largest scales in space, we already observe an anti-gravity effect. We’ve known since the observations of, about a hundred years ago, that our universe is expanding – over time, the average distance between galaxies grows. But in the late 1990s, two independent teams of astronomers discovered something remarkable: Not only is the universe expanding, but that expansion is accelerating. The universe is expanding faster and faster every single day.
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NASA names moon mountain after Black mathematician and 'Hidden Figure' Melba MoutonElizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. She was contributing writer for Space.com for 10 years before joining full-time, freelancing since 2012. Elizabeth's reporting includes an exclusive with Office of the Vice-President of the United States, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, 'Why Am I Taller?', is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and (soon) a Bachelor of History from Athabasca University. Elizabeth is also a post-secondary instructor in communications and science since 2015. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: https://qoto.org/howellspace
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