Gravity on the Moon vs. Asteroid Bennu Animation
The lunar surface is better at resisting impacts than the loose surface of asteroid Bennu – thanks to the Moon’s much stronger gravity.
Asteroid Bennu is a dark, jumbled mass of rocks and boulders left over from the formation of the solar system. Roughly the height of a skyscraper, Bennu’s loose surface materials are held together by an incredibly weak gravitational field – with a minute tug less than one-hundred-thousandth the pull of Earth. What would it be like to touch down on such an environment?
On the Moon, gravity is sixteen percent as strong as it is on Earth and more than sixteen thousand times stronger than it is on Bennu. As a result, loose material in the lunar subsurface is packed together more tightly, making the Moon’s surface relatively firm. If a fifty-kilogram mass of solid iron were to hit the Moon traveling at ten centimeters per second, it would sink into the ground by only half a centimeter.
Repeating this experiment at Bennu would yield a dramatically different result. Though the mass would strike the asteroid’s surface with the same force, it would plunge seventeen centimeters before stopping – over thirty times deeper than at the Moon. This video is public domain and along with other supporting visualizations can be downloaded from the Scientific Visualization Studio at: http://svs.gsfc.nasa.gov/13425 NASA's Goddard Space Flight Center Conceptual Image Lab/Dan Gallagher If you liked this video, subscribe to the NASA Goddard YouTube channel: http://www.youtube.com/NASAExplorer Follow NASA’s Goddard Space Flight Center • Instagram http://www.instagram.com/nasagoddard • Twitter http://twitter.com/NASAGoddard • Twitter http://twitter.com/NASAGoddardPix • Facebook: http://www.facebook.com/NASA.GSFC • Flickr http://www.flickr.com/photos/gsfc
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