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Articles on Gravity

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Artist concept of Gravity Probe B orbiting the Earth to measure space-time, a four-dimensional description of the universe including height, width, length, and time. (NASA)

Gravitational distortion of time helps tell modified gravity apart from a dark force

The gravitational field can affect space and time: the stronger gravity is, the slower time moves. This prediction of General Relativity can be used to reveal hidden forces acting on dark matter.
As new and powerful telescopes gather new data about the universe, they reveal the limits of older theories. (Shutterstock)

Why Einstein must be wrong: In search of the theory of gravity

Einstein’s theory of general relativity suggests that our universe originated in a Big Bang. But black holes, and their gravitational forces, challenge the limits of Einstein’s work.
The Seli’š Ksanka Qlispe’ Dam provides enough electricity for about 147,000 homes in the Flathead Indian Reservation in Montana. Martina Nolte via Wikimedia Commons

What is hydroelectric energy and how does it work?

How does flowing water make electricity? An engineer explains hydroelectric generation.
Spiral galaxies like M100, pictured here, may hold answers about the nature of dark matter. NASA Spitzer Space Telescope/NASA/JPL-Caltech

We don’t know if dark matter exists. So why do astronomers keep looking?

A comparison of star-forming galaxies suggests, surprisingly, that dark matter and visible matter do interact – taking us closer to understanding what keeps the galaxies together.
VFTS 243 is a binary system of a large, hot blue star and a black hole orbiting each other, as seen in this animation. ESO/L.Calçada

Astronomers have found an especially sneaky black hole – discovery sheds light on star death, black hole formation and gravitational waves

Astronomers have discovered the first dormant black hole outside of the Milky Way. These black holes are not absorbing matter from a nearby star, making them incredibly hard to find.
Ski jumpers use aerodynamics and physics to overcome gravity – at least for a while. AP Photo/Matthias Schrader

Ski jump: Flying or falling with style?

Ski jumpers do everything they can to counteract the effects of gravity and fly as far as they can down hills.

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