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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)
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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)
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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)
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All Nobel Prizes in Physics (Nobel Foundation)
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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)
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American Institute of Physics (AIP)


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News E-Print Archive (Cornell University)
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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.

  • Risk of psychotic disorders has disease-specific...
    on August 20, 2019 at 4:00 am

    (Elsevier) Brain abnormalities in people at familial risk of schizophrenia and bipolar disorder emerge in unique patterns, despite the symptom and genetic overlap of the disorders, according to a study in Biological Psychiatry, published by Elsevier. Similarities between schizophrenia and bipolar disorder have led to the diagnoses being increasingly combined in studies of psychosis, but the findings highlight that risk for the disorders has distinct effects on the brain.

  • The journey of the pollen
    on August 20, 2019 at 4:00 am

    (Kiel University) When insects carry the pollen from one flower to another to pollinate them, the pollen must attach to and detach from different surfaces. Scientists from Kiel University have discovered that the mechanisms are far more complex than previously assumed. They differ depending on the duration of the contact and the microstructure of the plant surfaces. The results could be interesting for drug delivery and for developing alternative strategies in agriculture and food production.

  • Multi-tasking protein at the root of neuropathic...
    on August 20, 2019 at 4:00 am

    (Osaka University) Neuropathic pain is a chronic condition resulting from nerve injury and is characterized by increased pain sensitivity. Although known to be associated with overly excitable neurons in the spinal cord, the mechanisms leading to chronic pain are poorly understood. Researchers from Osaka University have now shown that expression of a protein called FLRT3 in the spinal dorsal root ganglion causes pain sensitization, which can be alleviated by treatment with FLRT3-blocking […]

  • New protein spin labelling technique
    on August 20, 2019 at 4:00 am

    (University of Konstanz) University of Konstanz researchers develop a new site-directed spin labelling approach based on genetically encoded noncanonical amino acids amenable to Diels-Alder chemistry as well as a new spin label, PaNDA.

  • Stardust in the Antarctic snow
    on August 20, 2019 at 4:00 am

    (Technical University of Munich (TUM)) The rare isotope iron-60 is created in massive stellar explosions. Only a very small amount of this isotope reaches the earth from distant stars. Now, a research team with significant involvement from the Technical University of Munich (TUM) has discovered iron-60 in Antarctic snow for the first time. The scientists suggest that the iron isotope comes from the interstellar neighborhood.

  • Embryology: a sequence of reflexive contractions...
    on August 20, 2019 at 4:00 am

    (CNRS) It normally takes about 21 days for chicken embryos to develop into chicks. By observing chicken hindlimb formation, a CNRS / Université de Paris research team has just discovered that the mechanism at the origin of embryonic development consists of a sequence of reflexive contractions. The researchers were able to artificially recreate the same process and accelerate it by as much as a factor of 20.

  • How to improve multiple sclerosis therapy
    on August 20, 2019 at 4:00 am

    (Ruhr-University Bochum) Medications currently used to treat multiple sclerosis (MS) can merely reduce relapses during the initial relapsing-remitting phase. Many patients, however, develop progressive MS at a later stage, with disability becoming progressively worse. This type cannot be sufficiently treated at yet. Possible causes why an effective therapy for progressive MS is still lacking have been compiled by an international research team in a review article in the journal Nature Reviews […]

  • MSD and Francis Crick Institute unite to tackle...
    on August 20, 2019 at 4:00 am

    (The Francis Crick Institute) Scientists at global biopharmaceutical company MSD (Merck in the US) and the Francis Crick Institute have started a unique new collaboration to understand the causes of Motor Neurone Disease and identify potential targets for future treatments.

  • Shedding light on the reaction mechanism of PUVA...
    on August 20, 2019 at 4:00 am

    (Heinrich-Heine University Duesseldorf) Together with their Munich-based colleagues, a team of physical chemists from Heinrich Heine University Düsseldorf (HHU) has clarified which chemical reactions take place during PUVA therapy. The therapy involves light-induced damage to the DNA of diseased cells. The team working under Prof. Dr. Peter Gilch has now published its findings in the Journal of the American Chemical Society.

  • New immune system understanding may help doctors...
    on August 20, 2019 at 4:00 am

    (University of Colorado Anschutz Medical Campus) University of Colorado Cancer Center study overturns conventional wisdom to show that immune system natural killer cells recognize cancer DNA displayed by HLA class 2 genes, offering a new way to point the immune system at cancer.

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

  • Scientists discover star dust in Antarctic snow
    on August 20, 2019 at 4:04 pm

    A team of scientists hauled 500 kilograms of fresh snow back from Antarctica, melted it, and sifted through the particles that remained. Their analysis yielded a surprise: The snow held significant amounts of a form of iron that isn't naturally produced on Earth.

  • Researchers propose new holographic method to...
    on August 20, 2019 at 2:16 pm

    A research team from Osaka University, Nihon University and Chuo University has proposed a novel theoretical framework whose experiment could be performed in a laboratory to better understand the physics of black holes. This project can shed light on the fundamental laws that govern the cosmos on both unimaginably small and vastly large scales.

  • Measuring temperatures similar to those occurring...
    on August 20, 2019 at 1:40 pm

    Collisions between neutron stars are fascinating cosmic events that lead to the formation of numerous chemical elements. Temperatures during these collisions are exponentially high, typically reaching up to hundreds of billions of degrees Celsius.

  • Watching electrons using extreme ultraviolet light
    on August 20, 2019 at 12:01 pm

    A new technique developed by a team at MIT can map the complete electronic band structure of materials at high resolution. This capability is usually exclusive to large synchrotron facilities, but now it is available as a tabletop laser-based setup at MIT. This technique, which uses extreme ultraviolet (XUV) laser pulses to measure the dynamics of electrons via angle-resolved photoemission spectroscopy (ARPES), is called time-resolved XUV ARPES.

  • Boosting computing power for the future of...
    on August 20, 2019 at 12:00 pm

    A new machine learning technology tested by an international team of scientists including MIT Assistant Professor Philip Harris and postdoc Dylan Rankin, both of the Laboratory for Nuclear Science, can spot specific particle signatures among an ocean of Large Hadron Collider (LHC) data in the blink of an eye.

  • Toward an 'orrery' for quantum gauge theory
    on August 20, 2019 at 11:00 am

    Physicists at ETH Zurich have developed a new approach to couple quantized gauge fields to ultracold matter. The method might be the basis for a versatile platform to tackle problems ranging from condensed-matter to high-energy physics.

  • New artificial compound eye could improve 3-D...
    on August 19, 2019 at 4:43 pm

    If you've ever tried to swat a fly, you know that insects react to movement extremely quickly. A newly created biologically inspired compound eye is helping scientists understand how insects use their compound eyes to sense an object and its trajectory with such speed. The compound eye could also be used with a camera to create 3-D location systems for robots, self-driving cars and unmanned aerial vehicles.

  • Scientists unveil first quantum simulation of 3-D...
    on August 19, 2019 at 3:03 pm

    Physicists from the Hong Kong University of Science and Technology (HKUST) and Peking University (PKU) have successfully created the world's first 3-D simulation of topological matter consisting of ultracold atoms. Previous attempts at topological matter simulations were limited to lower dimensions, due to challenges on how to characterize 3-D band topology in atomic systems. This breakthrough paves an opening to further examining new topological matter that cannot be well realized in solids. […]

  • Two advances in understanding the role of 'charge...
    on August 19, 2019 at 3:02 pm

    High-temperature superconductors, which carry electricity with zero resistance at much higher temperatures than conventional superconducting materials, have generated a lot of excitement since their discovery more than 30 years ago because of their potential for revolutionizing technologies such as maglev trains and long-distance power lines. But scientists still don't understand how they work.

  • Wired for sound: A third wave emerges in...
    on August 19, 2019 at 3:00 pm

    Optical fibres are our global nervous system, transporting terabytes of data across the planet in the blink of an eye.

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.

  • The physics of cell-size regulation across...
    by Clotilde Cadart on August 19, 2019 at 12:00 am

    Nature Physics, Published online: 19 August 2019; doi:10.1038/s41567-019-0629-yCell size is regulated by processes ranging from rapid fluctuations to slower growth and division. Limited dialogue between communities studying these disparate timescales has hindered our understanding of size control—a gap bridged by this Review.

  • Half-integer level shift of vortex bound states...
    by Lingyuan Kong on August 19, 2019 at 12:00 am

    Nature Physics, Published online: 19 August 2019; doi:10.1038/s41567-019-0630-5The authors use STM to show that there are two different classes of zero-bias peak in vortex cores of Fe(Te,Se). One class is topological, one not. These are distinguished by a shift in the energy levels of the excited states.

  • Molecular lattice clock with long vibrational...
    by S. S. Kondov on August 19, 2019 at 12:00 am

    Nature Physics, Published online: 19 August 2019; doi:10.1038/s41567-019-0632-3The realization of a molecular lattice clock based on vibrations in diatomic molecules is reported with coherence times lasting over tens of milliseconds, which is enabled by the use of a state-insensitive magic lattice trap.

  • The magic in molecules
    by Nicola Poli on August 19, 2019 at 12:00 am

    Nature Physics, Published online: 19 August 2019; doi:10.1038/s41567-019-0647-9The demonstration of high-resolution spectroscopy of Sr2 molecules trapped in an optical lattice at the ‘magic’ wavelength opens the way to precision control of molecular excitations.

  • Realization of density-dependent Peierls phases...
    by Frederik Görg on August 19, 2019 at 12:00 am

    Nature Physics, Published online: 19 August 2019; doi:10.1038/s41567-019-0615-4Non-trivial Peierls phases that depend on the site occupations for ultracold fermions in an optical lattice have been engineered in a Floquet approach, providing a fundamental ingredient for a density-dependent gauge field acting on ultracold matter.

  • Photonic Weyl points due to broken time-reversal...
    by Dongyang Wang on August 19, 2019 at 12:00 am

    Nature Physics, Published online: 19 August 2019; doi:10.1038/s41567-019-0612-7Photonic Weyl points—topologically chiral singularity points in three-dimensional momentum space—have been realized in a homogeneous non-reciprocal material without a crystal lattice structure.

  • Tissue fluidity promotes epithelial wound healing
    by Robert J. Tetley on August 12, 2019 at 12:00 am

    Nature Physics, Published online: 12 August 2019; doi:10.1038/s41567-019-0618-1An observation that cells at the edge of a healing wound readily undergo intercalation leads to the finding that tissue fluidity is crucial for effective wound closure.

  • Generation and acceleration of electron bunches...
    by A. Deng on August 12, 2019 at 12:00 am

    Nature Physics, Published online: 12 August 2019; doi:10.1038/s41567-019-0610-9Electron bunches are generated and accelerated to relativistic velocities by tunnel ionization of neutral gas species in a plasma. This represents a step towards ultra-bright, high-emittance beams in laser-plasma accelerators. 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.

  • Lab-on-a-chip drives search for new drugs to...
    on August 20, 2019 at 2:16 pm

    The effectiveness of current anti-clotting medication can be limited due to the risk of complications. This is driving a need for alternatives that can both prevent the formation of blood clots and reduce the risk of excessive and life-threatening bleeding. A new biocompatible lab-on-a-chip could help accelerate the discovery and development of new anti-clotting therapies, with automated processes that can achieve in a few minutes what could take days in a full-sized lab.

  • Lighting up proteins with Immuno-SABER
    on August 19, 2019 at 9:57 pm

    Researchers have developed a new DNA-nanotechnology-based approach called Immuno-SABER, that combines the protein targeting specificity of commonly available antibodies with a DNA-based signal-amplification strategy that enables the highly multiplexed visualization of many proteins in the same sample with pre-programmable and tunable fluorescence signals at each target site.

  • Towards an 'orrery' for quantum gauge theory
    on August 19, 2019 at 8:43 pm

    Physicists have developed a new approach to couple quantized gauge fields to ultracold matter. The method might be the basis for a versatile platform to tackle problems ranging from condensed-matter to high-energy physics.

  • Drawing inspiration from natural marvels to make...
    on August 19, 2019 at 8:43 pm

    The shape-shifting bristle worm has the unique ability to extend its jaw outside of its mouth and ensnare surprised prey. The metal coordination chemistry that makes this natural wonder possible can also be the key to creating new materials for use in sensors, healthcare applications, and much more.

  • New artificial compound eye could improve 3D...
    on August 19, 2019 at 5:21 pm

    A newly created biologically inspired compound eye is helping scientists understand how insects use their compound eyes to sense an object and its trajectory with such speed. The compound eye could also be used with a camera to create 3D location systems for robots, self-driving cars and unmanned aerial vehicles.

  • Spinning lightwaves on a one-way street
    on August 19, 2019 at 3:27 pm

    Researchers have created a quantum spin wave for light. This can be a carrier of information for future nanotechnologies but with a unique twist: they only flow in one direction.

  • Optic nerve stimulation to aid the blind
    on August 19, 2019 at 3:27 pm

    Scientists are investigating new ways to provide visual signals to the blind by directly stimulating the optic nerve. Their preliminary study uses a new type of neural electrode and provides distinct signals.

  • Wired for sound: A third wave emerges in...
    on August 19, 2019 at 3:27 pm

    A research renaissance into chip-based control of light-sound interactions could transform our 5G networks, satellite communications and defence industries. These interactions, known as Brillouin scattering, are set to underpin new designs in microchips and push our theoretical understanding of fundamental science.

  • Heat shield just 10 atoms thick to protect...
    on August 19, 2019 at 3:27 pm

    Atomically thin materials could create heat-shields for cell phones or laptops that would protect people and temperature-sensitive components and make future electronic gadgets even more compact.

  • Materials that can revolutionize how light is...
    on August 19, 2019 at 3:27 pm

    Scientists have designed organic molecules capable of generating two excitons per photon of light, a process called singlet fission. The excitons can live for much longer than those generated from their inorganic counterparts, which leads to an amplification of electricity generated per photon that is absorbed by a solar cell.