'Cosmic cannibals' expel jets into space at 40% speed of light
For the first time, astronomers have measured the speed of fast-moving jets in space, crucial to star formation and the distribution of elements needed for life.
For the first time, astronomers have measured the speed of fast-moving jets in space, crucial to star formation and the distribution of elements needed for life.
Astronomy
Mar 27, 2024
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A team of physicists and engineers affiliated with several institutions in China has developed a new kind of small, highly sensitive gravimeter that can operate stably at room temperature. In their project, reported in the ...
"3 Body Problem," Netflix's new big-budget adaptation of Liu Cixin's book series helmed by the creators behind "Game of Thrones," puts the science in science fiction.
General Physics
Mar 27, 2024
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NASA's BurstCube, a shoebox-sized satellite designed to study the universe's most powerful explosions, is on its way to the International Space Station.
Astronomy
Mar 22, 2024
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Gravitation, or gravity, is a natural phenomenon by which physical bodies attract with a force proportional to their mass. Gravitation is most familiar as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. Gravitation causes dispersed matter to coalesce, and coalesced matter to remain intact, thus accounting for the existence of the Earth, the Sun, and most of the macroscopic objects in the universe.
Gravitation is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the Moon in its orbit around the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena observed on Earth.
Gravitation is one of the four fundamental interactions of nature, along with electromagnetism, and the nuclear strong force and weak force. Modern physics describes gravitation using the general theory of relativity by Einstein, in which it is a consequence of the curvature of spacetime governing the motion of inertial objects. The simpler Newton's law of universal gravitation provides an accurate approximation for most physical situations.
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