These are organized by a classification scheme developed exclusively for Cosma. More…
relativity : a theory which is based on the two postulates (1) that the speed of light in a vacuum is constant and independent of the source or observer and (2) that the mathematical forms of the laws of physics are invariant in all inertial systems and which leads to the assertion of the equivalence of mass and energy and of change in mass, dimension, and time with increased velocity — called also special relativity, special theory of relativity — Webster
Relativity, generally refers to the theory of relativity usually encompasses two interrelated theories by Albert Einstein: special relativity and general relativity.
Special relativity applies to elementary particles and their interactions, describing all their physical phenomena except gravity.
General relativity explains the law of gravitation and its relation to other forces of nature. It applies to the cosmological and astrophysical realm, including astronomy.
The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts including spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction.
In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. — Wikipedia
Einstein, Oppenheimer, Feynman: Physics in the 20th Century (MIT OCW Physics)
Introduction to Nuclear and Particle Physics (MIT OCW Physics)
Relativity (MIT OCW Physics)
OER Commons: Open Educational Resources
Albert Einstein News -- ScienceDaily Albert Einstein in the News. Research institutes have been testing Albert Einstein's theory of special relativity and general relativity. Was Albert Einstein right?
Quantum jump tipping the balance
on May 7, 2020 at 5:13 pm
Measuring tiny differences in mass between different quantum states provides new insights into heavy atoms.
ESO telescope sees star dance around supermassive...
on April 16, 2020 at 11:26 am
Observations have revealed for the first time that a star orbiting the supermassive black hole at the center of the Milky Way moves just as predicted by Einstein's general theory of relativity. Its orbit is shaped like a rosette and not like an ellipse as predicted by Newton's theory of gravity. This long-sought-after result was made possible by increasingly precise measurements over nearly 30 years.
Testing Einstein's theory of general relativity
on April 9, 2020 at 2:03 pm
In another verification of the validity of Einstein's theory of general relativity scientists have used two finely tuned optical lattice clocks to make new ultra-precise measurements of the time dilation effect predicted by Einstein's theory of general relativity.
Looking for dark matter
on April 9, 2020 at 1:39 pm
Dark matter is thought to exist as 'clumps' of tiny particles that pass through the earth, temporarily perturbing some fundamental constants. A new article sets out two novel methods for measuring these tiny changes and thus detecting dark matter. Both use already existing experimental infrastructure.
High altitude water Cherenkov Observatory tests...
on March 31, 2020 at 5:00 pm
New measurements confirm, to the highest energies yet explored, that the laws of physics hold no matter where you are or how fast you're moving.
Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.
Discovery of ancient super-eruptions indicates...
on June 3, 2020 at 5:34 pm
Throughout Earth's long history, volcanic super-eruptions have been some of the most extreme events ever to affect our planet's rugged surface. Surprisingly, even though these explosions eject enormous volumes of material—at least 1,000 times more than the 1980 eruption of Mount St. Helens—and have the potential to alter the planet's climate, relatively few have been documented in the geologic record.
Collaborative research addresses need for...
on June 3, 2020 at 5:30 pm
A Northern Arizona University professor co-authored a paper on the importance of springs in a drying climate that is in the inaugural climate change refugia special edition of Frontiers in Ecology and the Environment.
Two new extinct primate species are found in the...
on June 3, 2020 at 2:30 pm
Sileshi Semaw from the Centro Nacional de Investigación sobre la Evolución Humana (CENIEH), is coauthor of a paper published in the Journal of Human Evolution about a large series of fossil cercopithecid primates named Pliopapio alemui and Kuseracolobus aramisi, two different new primate species dated between 4.8 and 4.3 million years ago known only from Gona and the Middle Awash study area in Ethiopia.
Rainy season tends to begin earlier in Northern...
on June 3, 2020 at 2:26 pm
Researchers from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Science (CAS) found that the rainy season of northern Central Asia, which occurs in May-July in present-day, will shift to March-May at the end of the 21st century. The study was published in Environmental Research Letters.
Scientist captures new images of Martian moon...
on June 3, 2020 at 2:17 pm
Christopher Edwards, assistant professor in NAU's Department of Astronomy and Planetary Science, just processed new images of the Martian moon Phobos that give scientists insight into the physical properties of the moon and its composition. The images of the small moon, which is about 25 kilometers (15 miles) in diameter, were captured by NASA's 2001 Mars Odyssey orbiter. When reviewed in combination with three previously released images, these new images could ultimately help settle the debate […]