09OCT 2024
Gravitational force depends on

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 children’s understanding of gravitational force and associated phenomena are identified. This…

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30SEP 2024
Universal law of motion

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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21SEP 2024
Higgs boson models

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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12SEP 2024
Theory of quantum gravity

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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03SEP 2024
Scientific law of gravity

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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25AUG 2024
Dark energy physics

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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16AUG 2024
Dark matter explained

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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07AUG 2024
Dark matter for Dummies

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 of matter seen. To account for these differences, it appears that the universe…

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