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Realm Cosmological, Physical, Terrestrial, Anthropological, Mystical


Universe Astronomical Instrument
Galaxy Milky Way, Andromeda
Planetary System Star, Brown Dwarf, Planet, Moon

Solar System Sun
Terrestrial Planet Mercury, Venus, Earth (Moon), Mars
Asteroid Belt Ceres, Vesta
Jovian Planet Jupiter, Saturn, Uranus, Neptune
Trans-Neptunian Object
Kuiper Belt Pluto, Haumea, Makemake
Scattered Disc Eris, Sedna, Planet X
Oort Cloud Etc. Scholz’s Star
Small Body Comet, Centaur, Asteroid

Physical Laws (Constants) Relativity
Matter Molecule, Atom (Periodic Table), Particle
Force Gravity, Electromagnetism (Light, Color)


These are organized by a classification scheme developed exclusively for Cosma. More…



Physics Central: Physics in Action (American Physical Society)
Physical Sciences Subject Guide (Library of Congress)
Introductory Physics Science Tracer Bullet (Library of Congress)
Physics Resources (Library of Congress)
Physics Internet Resources (Library of Congress)

Physical Science Subject Primer (National Network of Libraries of Medicine)
Physics Subject Primer (National Network of Libraries of Medicine)

Physics World

Physics Center (Martindale’s Reference Desk)
Physics Databases & Periodic Tables (Martindale’s Reference Desk)
CRC Handbook of Chemistry and Physics Online (99th Edition)

Natural and Physical Sciences Portal (Wikipedia)
Physical Sciences Portal (Wikipedia)
Physics Portal (Wikipedia)


Physical : (a) of or relating to physics (b) characterized or produced by the forces and operations of physics (c) having material existence : perceptible especially through the senses and subject to the laws of nature — Webster

OneLook, Free Dictionary, Wiktionary, Urban Dictionary

Realm : kingdom, sphere, domain — Webster

OneLook, Free Dictionary, Wiktionary, Urban Dictionary

Physical Realm : kingdom, sphere, or domain of things that have material existence and are perceptible, especially those things perceptible through the senses and subject to the laws of nature — M.E.Hopper


Physical universe In religion and esotericism, the term “physical universe” or “material universe” is used to distinguish the physical matter of the universe from a proposed spiritual or supernatural essence. — Wikipedia

Eric Weisstein’s World of Physics (ScienceWorld, Wolfram Research)
Encyclopædia Britannica


Outline of Physical Science (Wikipedia)
Outline of Physics (Wikipedia)


Physics (Wolfram Alpha)


Philosophical research online: Philosophy of Physical Science (PhilPapers)


Physical science is a branch of natural science that studies non-living systems, in contrast to life science. It in turn has many branches, each referred to as a “physical science”, together called the “physical sciences”. However, the term physical creates an unintended, somewhat arbitrary distinction, since many branches of physical science also study biological phenomena and branches of chemistry, such as organic chemistry. — Wikipedia

Encyclopædia Britannica

Physics is the natural science that studies matter and its motion and behavior through space and time and that studies the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves. — Wikipedia

Encyclopædia Britannica

Physics Center (Martindale’s Reference Desk)
Encyclopedia of Physics



SciShow Physics (YouTube Channel)

Center for History of Physics (American Institute of Physics)
History of Physics Exhibits (American Institute of Physics)
All Nobel Prizes in Physics (Nobel Foundation)
Physics History and Terminology (Eric Weisstein’s World of Physics, Wolfram Research)


WorldCat, Library of Congress, UPenn Online Books, Open Library



Crash Course Kids (YouTube Channel)

The Cheerios effect (TED Ed)
Physical Sciences (TED Ed)

Minute Physics (YouTube Channel)

The Physics Classroom (Tom Henderson)
DC Physics Help for Students


Crash Course Physics (YouTube Channel)

How Things Work: An Introduction to Physics (Coursera)
Physical Science Courses (Coursera)
Physics Courses (MIT Opencourseware)
Einstein, Oppenheimer, Feynman: Physics in the 20th Century (MIT Opencourseware)
OER Commons: Open Educational Resources



Careers in Physical Sciences (Physics World)
Careers in Physics (
General Physics (Ask an Astronomer, Cornell University)


American Physical Society (APS)
European Physical Society (EPS)
American Institute of Physics (AIP)


Conference Alerts Worldwide (Conal)

News E-Print Archive (Cornell University)
AAAS EurekaAlert, Nature, Physics World
Science News, Science Daily




Physics (It’s Okay To Be Smart, YouTube Channel)


What if?

What If? Answering your hypothetical questions with physics, every Tuesday.

  • Earth-Moon Fire Pole
    by xkcd on May 21, 2018 at 12:00 am

    <article class="entry"> <a href="//"><h1>Earth-Moon Fire Pole</h1></a> <p id="question">My son (5y) asked me today: If there were a kind of a fireman&#39;s pole from the Moon down to the Earth, how long would it take to slide all the way from the Moon to the Earth?</p> <p id="attribute">Ramon Schönborn, Germany</p> <p>First, let&#39;s get a few things out of the […]

  • Electrofishing for Whales
    by xkcd on March 9, 2017 at 12:00 am

    <article class="entry"> <a href="//"><h1>Electrofishing for Whales</h1></a> <p id="question">I used to work on a fisheries crew where we would use an electro-fisher backpack to momentarily stun small fish (30 - 100 mm length) so we could scoop them up with nets to identify and measure them. The larger fish tended to be stunned for slightly longer because of their larger surface area but I don&#39;t […]

  • Toaster vs. Freezer
    by xkcd on February 28, 2017 at 12:00 am

    <article class="entry"> <a href="//"><h1>Toaster vs. Freezer</h1></a> <p id="question">Would a toaster still work in a freezer?</p> <p id="attribute">—<a href="">My Brother, My Brother and Me</a>, <a […]

  • Coast-to-Coast Coasting
    by xkcd on February 8, 2017 at 12:00 am

    <article class="entry"> <a href="//"><h1>Coast-to-Coast Coasting</h1></a> <p id="question">What if the entire continental US was on a decreasing slope from West to East. How steep would the slope have to be to sustain the momentum needed to ride a bicycle the entire distance without pedaling?</p> <p id="attribute">—Brandon Rooks</p> <p>Too steep to actually build, […]

  • Hide the Atmosphere
    by xkcd on January 30, 2016 at 12:00 am

    <article class="entry"> <a href="//"><h1>Hide the Atmosphere</h1></a> <p id="question">Earth’s atmosphere is really thin compared to the radius of the Earth. How big a hole do I need to dig before people suffocate?</p> <p id="attribute">—Sam Burke</p> <p>The idea here is straightforward: When you dig a hole in the ground, the hole fills up with air.<span […]

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EurekAlert! - Chemistry, Physics and Materials Sciences The premier online source for science news since 1996. A service of the American Association for the Advancement of Science.

  • McMaster researchers uncover hidden antibiotic...
    on February 26, 2020 at 5:00 am

    (McMaster University) The research team found that CBG had antibacterial activity against drug-resistant MRSA. It prevented the ability of that bacteria to form biofilms, which are communities of microorganisms that attach to each other and to surfaces; and it destroyed preformed biofilms and cells resistant to antibiotics. CBG achieved this by targeting the cell membrane of the bacteria. These findings in the laboratory were supported when mice with an MRSA infection were given CBG.

  • Melting properties determine biological functions...
    on February 26, 2020 at 5:00 am

    (Johannes Gutenberg Universitaet Mainz) The bodies of ants are covered with wax-like substances known as cuticular hydrocarbons (CHCs) that serve communication as well as protection against desiccation. While recognition of other ants requires the CHC layer to be not too solid, desiccation protection requires it to be as solid as possible. To resolve this conflict between the needs of communication and waterproofing, this layer is composed of CHCs with special physical properties, as biologists […]

  • Discovery of entirely new class of RNA caps in...
    on February 26, 2020 at 5:00 am

    (Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences (IOCB Prague)) The group of Dr. Hana Cahová of the Institute of Organic Chemistry and Biochemistry of the CAS, in collaboration with scientists from the Institute of Microbiology of the CAS, has discovered an entirely new class of dinucleoside polyphosphate 5'RNA caps in bacteria and described the function of alarmones and their mechanism of function. The discovery was recently published in the journal […]

  • How low can you go? Lower than ever before
    on February 26, 2020 at 5:00 am

    (National Institute of Standards and Technology (NIST)) Researchers at the National Institute of Standards and Technology (NIST) have made the most sensitive measurements to date of how quickly electric charge moves in silicon, a gauge of its performance as a semiconductor.

  • Understanding the link between nicotine use and...
    on February 26, 2020 at 5:00 am

    (Georgetown University Medical Center) Lately, misuse of prescription benzodiazepines (such as alprazolam or Xanax, and diazepam or Valium) has been linked to nicotine use. Evidence of how nicotine 'sets up' a craving for benzodiazepines -- often called 'benzos' -- in animal laboratory studies has been published in the open-access journal eNeuro.

  • Scientists discover new clue behind age-related...
    on February 26, 2020 at 5:00 am

    (DOE/Lawrence Berkeley National Laboratory) Scientists at Berkeley Lab have made a surprising discovery that could help explain our risk for developing chronic diseases or cancers as we get older, and how our food decomposes over time.

  • Can a new kind of power plant improve air...
    on February 26, 2020 at 5:00 am

    (University of Houston) Researchers from the University of Houston, backed by $4 million in funding from the Texas Commission on Environmental Quality, have joined a pilot project testing the use of supercritical CO2, or pressurized carbon dioxide, to produce low-cost, low-emission electric power.

  • New compounds thwart multiple viruses, including...
    on February 26, 2020 at 5:00 am

    (American Chemical Society) According to a Feb. 13 report from the World Health Organization, the Wuhan coronavirus has stricken more than 46,000 people and has caused over 1,300 deaths since the first cases in Wuhan, China, in December 2019. Now, researchers reporting in ACS' Journal of Medicinal Chemistry have designed compounds that block the replication of similar coronaviruses, as well as other disease-causing viruses, in the lab. The compounds have not yet been tested in people. 

  • No benefit found in using broad-spectrum...
    on February 26, 2020 at 5:00 am

    (University of Utah Health) Doctors who use drugs that target antibiotic-resistant bacteria as a first-line defense against pneumonia should probably reconsider this approach, according to a new study of more than 88,000 veterans hospitalized with the disease. The study, conducted by University of Utah Health and VA Salt Lake City Health Care System researchers, found that pneumonia patients given these medications in the first days after hospitalization fared no better than those receiving […]

  • Researchers develop technique to create...
    on February 26, 2020 at 5:00 am

    (University of Central Florida) For the first time, a team of scientists at the University of Central Florida has created functional nanomaterials with hollow interiors that can be used to create highly sensitive biosensors for early cancer detection.

Physics News - Physics News, Material Sciences, Science News, Physics provides the latest news on physics, materials, nanotech, science and technology. Updated Daily.

  • Scientists make most sensitive measurements to...
    on February 26, 2020 at 8:42 pm

    Silicon, the best-known semiconductor, is ubiquitous in electronic devices including cellphones, laptops and the electronics in cars. Now, researchers at the National Institute of Standards and Technology (NIST) have made the most sensitive measurements to date of how quickly electric charge moves in silicon, a gauge of its performance as a semiconductor. Using a novel method, they have discovered how silicon performs under circumstances beyond anything scientists could test […]

  • Method with polarized light can create and...
    on February 26, 2020 at 6:41 pm

    Some molecules, including most of the ones in living organisms, have shapes that can exist in two different mirror-image versions. The right- and left-handed versions can sometimes have different properties, such that only one of them carries out the molecule's functions. Now, a team of physicists has found that a similarly asymmetrical pattern can be induced and measured at will in certain exotic materials, using a special kind of light beam to stimulate the material.

  • Explained: Why water droplets 'bounce off the...
    on February 26, 2020 at 6:08 pm

    University of Warwick researchers can now explain why some water droplets bounce like a beach ball off surfaces, without ever actually touching them. Now the design and engineering of future droplet technologies can be made more precise and efficient.

  • Study identifies a transition in the strong...
    on February 26, 2020 at 4:00 pm

    Most ordinary matter is held together by an invisible subatomic glue known as the strong nuclear force—one of the four fundamental forces in nature, along with gravity, electromagnetism, and the weak force. The strong nuclear force is responsible for the push and pull between protons and neutrons in an atom's nucleus, which keeps an atom from collapsing in on itself.

  • Scientists 'film' a quantum measurement
    on February 26, 2020 at 2:38 pm

    Measuring a quantum system causes it to change—one of the strange but fundamental aspects of quantum mechanics. Researchers at Stockholm University have now been able to demonstrate how this change happens. The results are published in the scientific journal Physical Review Letters.

  • A possible new way to cool computer chips
    on February 26, 2020 at 2:11 pm

    A team of researchers at Stanford University has developed a theoretical way to cool down heated objects. In their paper published in the journal Physical Review Letters, the group describes their study of heat radiation and how it might be boosted to cool down a desired object.

  • Engineers ensure quantum experiments get off to...
    on February 26, 2020 at 2:09 pm

    The quantum mechanical properties of electrons are beginning to open the door to a new class of sensors and computers with abilities far beyond what their counterparts based in classical physics can accomplish. Quantum states are notoriously difficult to read or write, however, and to make things worse, uncertainty about those states' starting conditions can make experiments more laborious or even impossible.

  • Lights, camera, action... the super-fast world of...
    on February 25, 2020 at 6:12 pm

    Cameras shooting up to 25,000 frames a second have been used to capture the moment two droplets of liquid come together and mix—and it is opening up research into new applications for 3-D printing.

  • Simple self-charging battery offers power...
    on February 25, 2020 at 4:00 pm

    A new type of battery combines negative capacitance and negative resistance within the same cell, allowing the cell to self-charge without losing energy, which has important implications for long-term storage and improved output power for batteries.

  • Radio waves detect particle showers in a block of...
    on February 25, 2020 at 2:37 pm

    When neutrinos crash into water molecules in the billion-plus tons of ice that make up the detector at the IceCube Neutrino Observatory in Antarctica, more than 5,000 sensors detect the light of subatomic particles produced by the collisions. But as one might expect, these grand-scale experiments don't come cheap.

Nature Physics - Issue - science feeds Nature Physics offers a unique mix of news and reviews alongside top-quality research papers. Published monthly, in print and online, the journal reflects the entire spectrum of physics, pure and applied.

  • Publisher Correction: Universal gap scaling in...
    by Jingfang Fan on February 24, 2020 at 12:00 am

    Nature Physics, Published online: 24 February 2020; doi:10.1038/s41567-020-0837-5Publisher Correction: Universal gap scaling in percolation

  • Author Correction: Chip-to-chip quantum...
    by Daniel Llewellyn on February 24, 2020 at 12:00 am

    Nature Physics, Published online: 24 February 2020; doi:10.1038/s41567-020-0840-xAuthor Correction: Chip-to-chip quantum teleportation and multi-photon entanglement in silicon

  • Interacting contagions
    by Sune Lehmann on February 24, 2020 at 12:00 am

    Nature Physics, Published online: 24 February 2020; doi:10.1038/s41567-020-0817-9Complex contagions — for example when ideas spread across a network — are thought to be different from the simple contagions observed for infections. Simple contagions are now shown to exhibit a key macroscopic characteristic of complex behaviour when they interact.

  • Macroscopic patterns of interacting contagions...
    by Laurent Hébert-Dufresne on February 24, 2020 at 12:00 am

    Nature Physics, Published online: 24 February 2020; doi:10.1038/s41567-020-0791-2Knowledge of the spreading mechanisms of contagions is important for understanding a range of epidemiological and social problems. A study now shows that so-called simple and complex contagions cannot be told apart if there is more than one simple contagion traversing the population at the same time.

  • Gapless ground state in the archetypal quantum...
    by P. Khuntia on February 17, 2020 at 12:00 am

    Nature Physics, Published online: 17 February 2020; doi:10.1038/s41567-020-0792-1Herbertsmithite is an experimental realization of the so-called quantum kagome antiferromagnet, a system that is predicted to host a spin liquid state down to zero temperature. Detailed NMR measurements now confirm that this is the case, and that its ground state is indeed gapless.

  • Symmetry-breaking-induced plasmonic exceptional...
    by Jun-Hee Park on February 17, 2020 at 12:00 am

    Nature Physics, Published online: 17 February 2020; doi:10.1038/s41567-020-0796-xThe hybridized modes of an asymmetric plasmonic dimer show avoided crossing of both the real and imaginary parts. This can lead to plasmonic exceptional points, which are used for biosensing with very high sensitivity.

  • Mode-locking dissected
    by F. Ömer Ilday on February 10, 2020 at 12:00 am

    Nature Physics, Published online: 10 February 2020; doi:10.1038/s41567-020-0811-2Despite the wide use of mode-locked lasers, no general theory for mode-locking exists. An attractor dissection approach provides some intuitive understanding of the complex dynamics in one type of mode-locking.

  • Mechanisms of spatiotemporal mode-locking
    by Logan G. Wright on February 10, 2020 at 12:00 am

    Nature Physics, Published online: 10 February 2020; doi:10.1038/s41567-020-0784-1Mode-locking of lasers can be understood as self-organization, and the three-dimensional case of spatiotemporal mode-locking can described using attractor dissection theory, which helps develop an intuition for this complex case. news Latest news from

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Matter & Energy News -- ScienceDaily Detectors and electronics. Learn about every sort of detector, radar system and more from leading research institutes around the world.

  • Silicon's exact conductivity for future solar...
    on February 26, 2020 at 8:20 pm

    Researchers have made the most sensitive measurements to date of how quickly electric charge moves in silicon, a gauge of its performance as a semiconductor.

  • Sweat sensor detects stress levels; May find use...
    on February 26, 2020 at 6:41 pm

    A researcher has developed a sweat sensor capable of monitoring levels of cortisol in the body.

  • Using light to put a twist on electrons
    on February 26, 2020 at 6:13 pm

    Method with polarized light can create and measure nonsymmetrical states in a layered material.

  • New patented invention stabilizes, rotates...
    on February 26, 2020 at 6:05 pm

    Many satellites are in space to take photos. But a vibrating satellite, like a camera in shaky hands, can't get a sharp image. Pointing it at a precise location to take a photo or perform another task, is another important function requiring accuracy.

  • Breaking down stubborn molecules in the ocean
    on February 26, 2020 at 6:05 pm

    Seawater is more than just saltwater. The ocean is a veritable soup of chemicals.

  • Explained: Why water droplets 'bounce off the...
    on February 26, 2020 at 6:05 pm

    Researchers can now explain why some water droplets bounce like a beach ball off surfaces, without ever actually touching them. Now the design and engineering of future droplet technologies can be made more precise and efficient.

  • Poor cleaning can jeopardize sterilization of...
    on February 26, 2020 at 4:08 pm

    Vaporized hydrogen peroxide (VHP) failed to completely sterilize surgical tools 76% of the time when the tools were soiled with salts or blood and not cleaned prior to sterilization, according to a new study.

  • Nanosize device 'uncloaks' cancer cells in mice...
    on February 26, 2020 at 4:08 pm

    Scientists report they have designed and successfully tested an experimental, super small package able to deliver molecular signals that tag implanted human cancer cells in mice and make them visible for destruction by the animals' immune systems. The new method was developed, say the researchers, to deliver an immune system 'uncloaking' device directly to cancer cells.

  • Perovskite solar cells made with peppermint oil...
    on February 26, 2020 at 3:21 pm

    Engineers have developed eco-friendly-solvent processable hole transport polymers by using peppermint oil and walnut aroma food additives and the polymer can prevent lead leakage.

  • Fur-friendly 'wearable for pets' and their humans
    on February 26, 2020 at 3:21 pm

    Researchers have invented a new health tracking sensor for pets and people that monitors vital signs through fur or clothing.