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TWDK Physics doodle by Giles Meakin

Physics seeks to answer the question "Why?" - to describe all the things we see, as well as their motion, behaviour and interactions. The science covers the entire history and future of the universe, and all objects from the fundamental matter we’re made from to the structure of galaxies.

Physicists look for patterns by making observations of the natural world, and models are developed to describe and predict them. Instruments, observations and experiments are then used to test and refine these models. Physicists sometimes aim to describe new things, and other times to improve the accuracy of an existing model. Based on the approach taken, each branch of physics can be divided into two aspects: theoretical and experimental. A key goal is often to combine several models into one - the ultimate goal of physicists in this respect is to complete "the theory of everything", though some believe this to be impossible.

While Theoretical physicists use mathematics to first describe the observed behaviour and then to explain it, experimental physicists perform experiments to test their hypotheses. Scientists believe that no hypothesis can ever be proven, so experiments are instead designed to disprove one - and "failing" to disprove it strengthens our confidence in it. Once a hypothesis is supported by several different tests and becomes accepted, it gets called a "theory" - but experimental physicists will continue to try to find problems with it, so that the theorists can further improve their models.

Our latest physics articles

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Image credit: ©
Shark migration and movement
Some sharks have daily routines, whilst many are crepuscular. Climate-driven migrations may explain apparent increases in shark sightings. Female bull sharks even ascent rivers to give birth – the only shark to tolerate fresh water.
Image credit: ©Wikimedia commons
Structure of the Earth
We still don't know a lot about what is right underneath our feet, let alone what’s lurking miles down.
Image credit: ©Licensed under CC BY-SA 3.0 via Wikimedia Commons
Gravity
The Theory of Gravity describes one of the most famous laws of physics, but surprisingly there are still many Things We Don't Know.
Image credit: ©
The Big Bang
The Big Bang Theory describes what may have happened during the very early stages of our Universe’s life.
Image credit: NASA/ WMAP Science Team
Cosmic Microwave Background
The Cosmic Microwave Background is a vast energy relic which fills every part of the Universe. We can detect it everywhere, but many questions lie unanswered.

Our latest physics blog posts

Our blog posts focus on a specialist topic.
Many are written by scientists about their ongoing research, others by the TWDK team.

TWDK red science flask
Is there a ninth planet in our Solar System?
Thursday 22nd of September 2016
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The Search for the Graviton
Monday 15th of August 2016
TWDK red science flask
The Case of the Jumping Carbons
Saturday 18th of June 2016
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100,000 Years Later
Saturday 6th of February 2016
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The Inspirational Butterfly
Wednesday 2nd of September 2015
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The Impossible Quasar at the Dawn of the Universe
Monday 3rd of August 2015
More blog posts about physics...

Delve deeper into Physics

Can't find what you're looking for? Browse the branches of physics that interest you most.

TWDK magnifying glassAstronomy is one of the oldest subjects of study. It seeks to understand everything outside of our world and explain how it got there.

TWDK magnifying glassAtomic Physics is all about the interactions between matter (the stuff everything is made from) and more matter, or between matter and light.

TWDK magnifying glassBiophysics uses the principles of physics to study life at every level, from atoms and molecules, to cells, organisms and environments.

TWDK magnifying glassChemical Physics is the study of chemical processes in terms of the atoms and particles that make up a system.

TWDK magnifying glassClassical Physics deals with the physics of everyday things - from ice cubes to bicycles, or cups of tea. Things we take for granted, but often don't really understand.

TWDK magnifying glassElectromagnetism is the study of one of the four fundamental forces in nature - the electromagnetic force, which mediates interactions between charged particles.

TWDK magnifying glassGeophysics refers to the study of the physics of the Earth and its environment in space, including its gravitational and magnetic fields, and its atmosphere.

TWDK magnifying glassMaterials Science deals with the structure and properties of materials.

TWDK magnifying glassMedical Physics ranges from enhancing diagnostic imagery to developing new techniques and equipment with which to treat patients.

TWDK magnifying glassParticle Physics is the study of the smallest things in the universe and the forces that govern their behaviour.

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