Related topics: nasa · satellite · earth · solar system · spacecraft

Asteroid mining not a million miles away

Work by a team of University of Adelaide scientists to perfect metal and mineral extraction processes is bringing the possibility of mining the wealth contained within asteroids closer to reality. But science fiction won't ...

Mass anomaly detected under the moon's largest crater

A mysterious large mass of material has been discovered beneath the largest crater in our solar system—the Moon's South Pole-Aitken basin—and may contain metal from the asteroid that crashed into the Moon and formed the ...

Multicolored light twists in new knotted ways

Around age six, we start learning how to tie our shoelaces, making knots that look like ribbons—or possibly more complex forms, if we are a little clumsy. We use knots every day, but the type of knots we generally use are ...

RAS statement on Starlink satellite constellation

The Royal Astronomical Society notes with concern the launch of the new SpaceX Starlink constellation of satellites into low-Earth orbit, and the potential impact of this and other programmes on views of the night sky and ...

Five things to know about NASA's Deep Space Atomic Clock

NASA is sending a new technology to space on June 22 that will change the way we navigate our spacecraft—even how we send astronauts to Mars and beyond. Built by NASA's Jet Propulsion Laboratory in Pasadena, California, ...

Rockets for education

Why rockets are so captivating is not exactly rocket science. Watching a chunk of metal defy the forces of gravity satisfies many a human's wish to soar through the air and into space.

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In physics, an orbit is the gravitationally curved path of one object around a point or another body, for example the gravitational orbit of a planet around a star.

Historically, the apparent motion of the planets were first understood in terms of epicycles, which are the sums of numerous circular motions. This predicted the path of the planets quite well, until Johannes Kepler was able to show that the motion of the planets were in fact elliptical motions.[citation needed] Isaac Newton was able to prove that this was equivalent to an inverse square, instantaneously propagating force he called gravitation.[citation needed] Albert Einstein later was able to show that gravity is due to curvature of space-time, and that orbits lie upon geodesics. This is the current understanding.

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