What is the definition of gravitational pull?
Laurie bit his lips, and turning a little from the pensive speaker, read the following document, with praiseworthy gravity, considering the spelling:A large, civil cocked hat, like those worn by clergymen within the last thirty years, surmounted the whole, furnishing dignity to a good-natured and somewhat…
Gravitational force depends on
Commonly referred to as gravity, it is important to encourage the use of the correct term, gravitational force. In the SPACE research report Forces (Russell, et al 1998) clear stages in the progression of childrens understanding of gravitational force and associated phenomena are identified. This…
Universal law of motion
While Copernicus rightly observed that the planets revolve around the Sun, it was Kepler who correctly defined their orbits. At the age of 27, Kepler became the assistant of a wealthy astronomer, Tycho Brahe, who asked him to define the orbit of Mars. Brahe had collected a lifetime of astronomical observations…
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Higgs boson models
An artist s conception of the Higgs boson. Credit: sakkmesterke/Shutterstock.com Editor s Note: This story was updated at 7:20 p.m. E.T. For a subatomic particle that remained hidden for nearly 50 years, the Higgs boson is turning out to be remarkably well behaved. Yet more evidence from the world s…
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Theory of quantum gravity
This division is concerned with the unification of general relativity and quantum mechanics into a theory of quantum gravity, which should also provide a consistent framework for incorporating the other fundamental forces in nature. Despite intense efforts over the last years it is far from clear at…
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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…
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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…
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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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