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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.

  • A new stable form of plutonium discovered at the...
    on October 18, 2019 at 4:00 am

    (European Synchrotron Radiation Facility) An international team of scientists, led by the Helmholtz Zentrum Dresden-Rossendorf (HZDR), have found a new compound of plutonium with an unexpected, pentavalent oxidation state, using the ESRF, the European Synchrotron., Grenoble, France This new phase of plutonium is solid and stable, and may be a transient phase in radioactive waste repositories. The results are published this week in Angewandte Chemie as a Very Important Paper (VIP).

  • Nitrogen-embedded polycyclic compound with strong...
    on October 18, 2019 at 4:00 am

    (Ehime University) Nitrogen-embedded polycyclic compounds with strong antiaromaticity and stability were synthesized and isolated for the first time using pyrrole as a key unit. An expedited approach toward stable antiaromatic polycyclic compounds enables not only the revealing of its fundamental properties, but also its application to organic electronic materials.

  • Energy flow in the nano range
    on October 18, 2019 at 4:00 am

    (University of Würzburg) It is crucial for photovoltaics and other technical applications, how efficiently energy spreads in a small volume. With new methods, the path of energy in the nanometer range can now be followed precisely.

  • Wind turbine design and placement can mitigate...
    on October 18, 2019 at 4:00 am

    (University of Illinois College of Agricultural, Consumer and Environmental Sciences) Wind energy is increasingly seen as a sustainable alternative to fossil fuels, as it contributes to a reduction in greenhouse gas emissions. However, the rapid expansion of wind farms has raised concerns about the impact of wind turbines on wildlife.A new study provides comprehensive data on how turbines affect bird populations. The study suggests ways to mitigate negative effects through wind turbine design […]

  • St. Jude Children's Research Hospital and IAEA...
    on October 18, 2019 at 4:00 am

    (St. Jude Children's Research Hospital) The International Atomic Energy Agency (IAEA) and St. Jude Children's Research Hospital are joining forces to combat childhood cancers in developing countries.

  • 'Flamenco dancing' molecule could lead to...
    on October 18, 2019 at 4:00 am

    (University of Warwick) A molecule that protects plants from overexposure to harmful sunlight thanks to its flamenco-style twist could form the basis for a new longer-lasting sunscreen, chemists at the University of Warwick have found, in collaboration with colleagues in France and Spain.

  • This blacksmith forged a sword using chemistry...
    on October 18, 2019 at 4:00 am

    (American Chemical Society) This week on Reactions we head to Portland, Oregon, and learn how blacksmithing is just as much chemistry as it is an artform.

  • A compound effective to chemotherapy-resistant...
    on October 18, 2019 at 4:00 am

    (Hokkaido University) A compound effective in killing chemotherapy-resistant glioblastoma-initiating cells (GICs) has been identified, raising hopes of producing drugs capable of eradicating refractory tumors with low toxicity.

  • Stress in the powerhouse of the cell
    on October 18, 2019 at 4:00 am

    (University of Freiburg) University of Freiburg researchers discover a new principle -- how cells protect themselves from mitochondrial defects.

  • Rapid increase in naloxone distribution after...
    on October 18, 2019 at 4:00 am

    (St. Michael's Hospital) The distribution of naloxone kits in Ontario increased rapidly after they were made available free of charge through community pharmacies and reached almost 68,000 people in a two-year period.

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

  • Quantum spacetime on a quantum simulator
    on October 18, 2019 at 12:00 pm

    Quantum simulation plays an irreplaceable role in diverse fields, beyond the scope of classical computers. In a recent study, Keren Li and an interdisciplinary research team at the Center for Quantum Computing, Quantum Science and Engineering and the Department of Physics and Astronomy in China, U.S. Germany and Canada. Experimentally simulated spin-network states by simulating quantum spacetime tetrahedra on a four-qubit nuclear magnetic resonance (NMR) quantum simulator. The experimental […]

  • Surfing on waves in a one-dimensional quantum...
    on October 18, 2019 at 11:29 am

    Physicists from the University of Luxembourg, together with international collaborators, have recently published an article in the internationally renowned journal Physical Review Letters. In this article, they demonstrate how quantum-mechanical interference effects could allow experimenters to better study the properties of particles trapped in quantum liquids via resonances in the absorption spectrum.

  • Blanket of light may give better quantum computers
    on October 17, 2019 at 6:00 pm

    Quantum mechanics is one of the most successful theories of natural science, and although its predictions are often counterintuitive, not a single experiment has been conducted to date of which the theory has not been able to give an adequate description.

  • Weaving quantum processors out of laser light
    on October 17, 2019 at 6:00 pm

    An international team of scientists from Australia, Japan and the United States has produced a prototype of a large-scale quantum processor made of laser light.

  • Discovery leads to ultrasensistive way to measure...
    on October 17, 2019 at 2:45 pm

    A team of UO physicists has drummed up a new way of measuring light: using microscopic drums to hear light.

  • Bio-circuitry mimics synapses and neurons in a...
    on October 17, 2019 at 11:41 am

    Researchers at the Department of Energy's Oak Ridge National Laboratory, the University of Tennessee and Texas A&M University demonstrated bio-inspired devices that accelerate routes to neuromorphic, or brain-like, computing.

  • Scientists discover fractal patterns in a quantum...
    on October 17, 2019 at 11:40 am

    A fractal is any geometric pattern that occurs again and again, at different sizes and scales, within the same object. This "self-similarity" can be seen throughout nature, for example in a snowflake's edge, a river network, the splitting veins in a fern, and the crackling forks of lightning.

  • Study reveals how age affects perception of white...
    on October 16, 2019 at 5:18 pm

    Although LEDs are increasingly used in low-energy lighting and displays, consumers sometimes find their light harsh or unpleasant. Findings from a new study point to the need to take age-related perception differences into account when designing white LED lighting that is more pleasing to the eye.

  • Researchers probe features of star clusters...
    on October 16, 2019 at 2:14 pm

    At the center of the galaxy, millions of stars whirl in orbits around a supermassive black hole. This circuit can take anywhere from a few hours for stars close to the event horizon of the black hole to thousands of years for their distant neighbors. The nature of the dance—how the stars interact collectively through their gravitational forces—can vary from galaxy to galaxy.

  • Small high-voltage transmission electron...
    on October 16, 2019 at 2:11 pm

    A team of researchers affiliated with several institutions in Japan has built a high-voltage transmission electron microscope small enough to reside in a university lab. In their paper published in the journal Physical Review Letters, the group describes building the first-of-its-kind microscope and how well it works.

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.

  • Light emission based on nanophotonic vacuum forces
    by Nicholas Rivera on October 14, 2019 at 12:00 am

    Nature Physics, Published online: 14 October 2019; doi:10.1038/s41567-019-0672-8Vacuum fluctuations in the vicinity of nanophotonic structures can lead to the conversion of a free electron into a polariton and a high-energy photon, whose frequency can be controlled by the electromagnetic properties of the nanostructure.

  • A fold strategy
    by Christian Santangelo on October 14, 2019 at 12:00 am

    Nature Physics, Published online: 14 October 2019; doi:10.1038/s41567-019-0684-4It is generally difficult to know in advance if a sheet of paper can be folded into an origami shape, but for quadrilateral crease patterns a tiling approach can identify all possible ways of folding them.

  • Jigsaw puzzle design of pluripotent origami
    by Peter Dieleman on October 14, 2019 at 12:00 am

    Nature Physics, Published online: 14 October 2019; doi:10.1038/s41567-019-0677-3The crease patterns for origami-based mechanical metamaterials can fold into myriad 3D shapes, but predicting foldability is no simple task. A framework for designing foldable patterns offers a neat alternative to extensive computer optimization.

  • A coherent nanomechanical oscillator driven by...
    by Yutian Wen on October 14, 2019 at 12:00 am

    Nature Physics, Published online: 14 October 2019; doi:10.1038/s41567-019-0683-5In a nanobeam that is strongly coupled to a single-electron transistor, electron tunnelling back-action induces self-sustaining mechanical oscillations. This oscillator can be compared to a phonon laser and can be stabilized.

  • Author Correction: Femtosecond-resolved...
    by N. Berrah on October 10, 2019 at 12:00 am

    Nature Physics, Published online: 10 October 2019; doi:10.1038/s41567-019-0706-2Author Correction: Femtosecond-resolved observation of the fragmentation of buckminsterfullerene following X-ray multiphoton ionization

  • Microwave-to-optics conversion using a mechanical...
    by Moritz Forsch on October 7, 2019 at 12:00 am

    Nature Physics, Published online: 07 October 2019; doi:10.1038/s41567-019-0673-7Electro-optomechanical conversion between optical and microwave photons is achieved with minimal added noise by cooling the mechanical oscillator to its quantum ground state. This has potential for future coherence-preserving transduction.

  • Cooling and self-oscillation in a nanotube...
    by C. Urgell on October 7, 2019 at 12:00 am

    Nature Physics, Published online: 07 October 2019; doi:10.1038/s41567-019-0682-6The back-action of electrons can cool a nanomechanical oscillator to a few-quantum state when a current flows through a suspended nanotube. The electron back-action, which is attributed to an electrothermal effect, also induces self-oscillations.

  • Vibrational spectroscopy at atomic resolution...
    by Kartik Venkatraman on October 7, 2019 at 12:00 am

    Nature Physics, Published online: 07 October 2019; doi:10.1038/s41567-019-0675-5Conventional on-axis electron energy-loss spectroscopy can detect vibrational modes in crystals and amorphous solids at atomic resolution by isolating the specific signal from the background signal and the dipole contributions. 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.

  • Artificial skin creates first ticklish devices
    on October 20, 2019 at 12:49 pm

    A new interface takes touch technology to the next level by providing an artificial skin-like membrane for augmenting interactive devices such as phones, wearables or computers.

  • New haptic arm places robotics within easy reach
    on October 20, 2019 at 12:49 pm

    Imagine being able to build and use a robotic device without the need for expensive, specialist kit or skills. That is the vision that researchers have now turned into reality, creating a lightweight, affordable and simple solution for everyday users.

  • Researchers quantify Cas9-caused off-target...
    on October 19, 2019 at 7:40 pm

    Scientists are finding new ways to improve the use of the CRISPR enzyme Cas9 and reduce the chances of off-target mutations in laboratory mice, according to new results. The findings will help scientists contextualize a common concern related to gene editing and identify new strategies to improve its precision.

  • Novel nanoprobes show promise for optical...
    on October 18, 2019 at 10:10 pm

    Researchers have developed ultrasensitive nanoscale optical probes to monitor the bioelectric activity of neurons and other excitable cells. This novel readout technology could enable scientists to study how neural circuits function at an unprecedented scale by monitoring large numbers of individual neurons simultaneously. It could also lead to high-bandwidth brain-machine interfaces with dramatically enhanced precision and functionality.

  • Why modified carbon nanotubes can help the...
    on October 18, 2019 at 5:11 pm

    Scientists have conducted an in-depth study on how carbon nanotubes with oxygen-containing groups can be used to greatly enhance the performance of perovskite solar cells. The newly discovered self-recrystallization ability of perovskite could lead to improvement of low-cost and efficient perovskite solar cells.

  • Flexible, wearable supercapacitors based on...
    on October 18, 2019 at 3:35 pm

    Evening gowns with interwoven LEDs may look extravagant, but the light sources need a constant power supply from devices that are as well wearable, durable, and lightweight. Chinese scientists have manufactured fibrous electrodes for wearable devices that are flexible and excel by their high energy density. A microfluidic technology was key for the preparation of the electrode material was a microfluidic technology, as shown in the journal Angewandte Chemie.

  • A new stable form of plutonium discovered
    on October 18, 2019 at 3:21 pm

    Scientists have found a new compound of plutonium with an unexpected, pentavalent oxidation state. This new phase of plutonium is solid and stable, and may be a transient phase in radioactive waste repositories.

  • All plastic waste could become new, high-quality...
    on October 18, 2019 at 3:21 pm

    A research group has developed an efficient process for breaking down any plastic waste to a molecular level. The resulting gases can then be transformed back into new plastics - of the same quality as the original. The new process could transform today's plastic factories into recycling refineries, within the framework of their existing infrastructure.

  • Croissant making inspires renewable energy...
    on October 18, 2019 at 12:06 pm

    The art of croissant making has inspired researchers to find a solution to a sustainable energy problem.

  • 'Flamenco dancing' molecule could lead to...
    on October 18, 2019 at 12:06 pm

    A molecule that protects plants from overexposure to harmful sunlight thanks to its flamenco-style twist could form the basis for a new longer-lasting sunscreen, chemists have found.