Scientists have unveiled a new approach to detecting gravitational waves in the milli-Hertz frequency range, providing access to astrophysical and cosmological phenomena that are not detectable with current instruments.
Astronomy
Oct 2, 2025
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121
In 1951, physicist Julian Schwinger theorized that by applying a uniform electrical field to a vacuum, electron-positron pairs would be spontaneously created out of nothing, through a phenomenon called quantum tunneling.
Condensed Matter
Sep 1, 2025
1
226
New research presented at the 2025 European Society of Cardiology Congress in Madrid, Spain, has found a more effective way to conduct cardiopulmonary resuscitation (CPR) in microgravity, which causes the weightlessness astronauts ...
Space Exploration
Aug 27, 2025
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2
If Earthlings are ever going to colonize Mars, they won't be able to do so on an empty stomach—and Temidayo Oniosun thinks a helping of Egusi soup, a Nigerian staple, might just hit the spot.
Space Exploration
Aug 8, 2025
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59
NASA Artemis missions are working toward a near future where humans are an interplanetary species—lunar bases are planned by 2030 and a round trip to Mars in 2039.
Space Exploration
Jul 25, 2025
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1
It is true that crewed missions to the moon are expensive, difficult, and dangerous. And we now have a long history going back decades of reliable, dependable, capable robotic exploration, including fly-bys, orbiters, landers, ...
Space Exploration
Jul 22, 2025
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0
At the forefront of discovery, where cutting-edge scientific questions are tackled, we often don't have much data. Conversely, successful machine learning (ML) tends to rely on large, high-quality data sets for training. ...
Quantum Physics
Jul 17, 2025
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91
When astronauts finally reach Mars, they'll face a unique challenge: walking and working in gravity that's only 37% as strong as Earth's. After spending months in the weightlessness of space, their weakened muscles and bones ...
Space Exploration
Jun 16, 2025
1
6
A new study has revealed a novel effect caused by dark photons—hypothetical particles thought to make up a portion of the universe's elusive dark matter. This discovery, made within the framework of Einstein–Cartan–Holst ...
General Physics
Jun 3, 2025
2
74
Wide binary stars with separation greater than about 2000 astronomical units are interesting natural laboratories that allow a direct probe of gravity at low acceleration weaker than about 1 nanometer per second squared. ...
Astronomy
May 27, 2025
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67
Gravitation is a natural phenomenon by which objects with mass attract one another. In everyday life, gravitation is most commonly thought of as the agency which lends weight to objects with mass. Gravitation compels dispersed matter to coalesce, thus accounting for the existence of the Earth, the Sun, and most of the macroscopic objects in the universe. It 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 convection, by which fluid flow occurs under the influence of a temperature gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena observed on Earth. Modern physics describes gravitation using the general theory of relativity, in which gravitation is a consequence of the curvature of spacetime which governs the motion of inertial objects. The simpler Newton's law of universal gravitation provides an accurate approximation for most calculations.
The terms gravitation and gravity are mostly interchangeable in everyday use, but a distinction is made in scientific circles. "Gravitation" is a general term describing the phenomenon by which bodies with mass are attracted to one another, while "gravity" refers specifically to the net force exerted by the Earth on objects in its vicinity as well as by other factors, such as the Earth's rotation.
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