Reference Terms
from Wikipedia, the free encyclopedia
Gravitation
Gravity is a force of attraction that acts between bodies that have mass.
Note: The above text is excerpted from the Wikipedia article "Gravitation", which has been released under the GNU Free Documentation License.
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Matter & Energy News
April 16, 2025
Apr. 11, 2025 — A team of researchers reported the first direct observation of a surprising quantum phenomenon predicted over half a century ago known as a superradiant phase transition, which occurs when two groups of quantum particles begin to fluctuate in a ...
Apr. 9, 2025 — A hopping, insect-sized robot can jump over gaps or obstacles, traverse rough, slippery, or slanted surfaces, and perform aerial acrobatic maneuvers, while using a fraction of the energy required for flying ...
Apr. 7, 2025 — A web platform uses a chatbot to enable any chemist -- including undergraduate chemistry majors -- to configure and execute complex quantum mechanical simulations through ...
Apr. 2, 2025 — Smaller than a grain of rice, new pacemaker is particularly suited to the small, fragile hearts of newborn babies with congenital heart defects. Tiny pacemaker is paired with a small, soft, flexible wearable patch that sits on the patient's chest. ...
Latest Headlines
updated 12:56 pm ET
Apr. 16, 2025 — Crime scene investigation may soon become significantly more accurate and efficient thanks to a new method for detecting gunshot residues. ...
Apr. 16, 2025 — Researchers developed a machine-learning-guided technique to solve complex, long-horizon planning problems more efficiently than some traditional approaches, while arriving at an optimal solution ...
Apr. 16, 2025 — A recently created RoboBee is now outfitted with its most reliable landing gear to date, inspired by one of nature's most graceful landers: the crane fly. The team has given their flying robot a set ...
Apr. 16, 2025 — A researcher has developed an autonomous driving algorithm for agricultural robots used for greenhouse cultivation and other farm ...
Apr. 16, 2025 — A research team develops a new alloy that maintains tensile properties from -196 degrees Celsius to 600 degrees ...
Apr. 16, 2025 — There's a sensation that you experience -- near a plane taking off or a speaker bank at a concert -- from a sound so total that you feel it in your very being. When this happens, not only do your ...
Apr. 16, 2025 — When two materials come into contact, charged entities on their surfaces get a little nudge. This is how rubbing a balloon on the skin creates static electricity. Likewise, water flowing over some ...
Apr. 16, 2025 — A team of researchers has successfully predicted abnormal grain growth in simulated polycrystalline materials for the first time -- a development that could lead to the creation of stronger, more ...
Apr. 16, 2025 — Physicists have created a compact laser that emits extremely bright, short pulses of light in a useful but difficult-to-achieve wavelength range, packing the performance of larger photonic devices ...
Apr. 16, 2025 — Switching from diesel to electric trains dramatically improved the air quality aboard the San Francisco Bay Area's Caltrain commuter rail line, reducing riders' exposure to the carcinogen black ...