Scientific law of gravity
[Textbook disclaimers are down, but not out. This satirical look at only a theory disclaimers imagines what might happen if advocates applied the same logic to the theory of gravitation that they do to the theory of evolution.] All physics textbook should include this warning label: This textbook contains…
Dark energy physics
DESI, the Dark Energy Spectroscopic Instrument, is an exceptional apparatus designed to improve our understanding of the role of dark energy in the expansion history of the universe; it will do this by measuring the redshifts of more than 30 million galaxies and quasars, with unprecedented precision…
Dark matter explained
Astronomers know more about what dark matter is not than what it actually is. Credit: Karl Tate, SPACE.com Infographics Artist Most of the universe is made up of dark energy, a mysterious force that drives the accelerating expansion of the universe. The next largest ingredient is dark matter, which only…
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Dark matter for Dummies
Two of the biggest mysteries of both string theory and cosmology are the presence of unseen dark matter and of repulsive gravity in the form of dark energy. Dark matter: The source of extra gravity Astronomers have discovered that the gravitational effects observed in our universe don’t match the amount…
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Dark matter Real
There’s nothing like dark matter to fire up a discussion about astrophysics. We have lots of evidence to support dark matter, and we’ve determined some of it’s physical properties such as the fact that it is cold rather than hot (ruling out things like neutrinos). But because we don’t know everything…
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Gravity force for Kids
Learn interesting trivia and information about a wide range of science topics with our fun science facts for kids. Gravity Facts Enjoy our range of interesting gravity facts that help explain how gravity relates to both life on Earth and other objects in our solar system. Learn about important concepts…
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Gravitational constant on the Moon
Bibliographic Entry Result (w/surrounding text) Standardized Result Hecht Eugene & Frederick J. Bueche. College Physics . USA: McGraw-Hill, 1997. On the Moon, the free-fall acceleration is 1.6 m/s2. 1.6 m/s2 Moon. World Book Encyclopedia Online Reference Center . World Book, 2004. Because the…
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Pull of gravity on Earth
Astronauts and space tourists may rhapsodize about feeling weightless during spaceflight, but don t be fooled by the somewhat misleading term zero-gravity. Every object in space still feels the gravitational pull from other objects, including space travelers who imagine themselves free of Earth s gravitational…
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