Unsolved problems in physics

The Tunguska event was a large explosion that occurred near the Stony Tunguska River, in Yeniseysk Governorate (now Krasnoyarsk Krai), Russia, on the morning of 30 June 1908 (N.S.).

Dark flow is an astrophysical term describing a possible non-random component of the peculiar velocity of galaxy clusters.

Naga fireballs (Thai: บั้งไฟพญานาค; rtgs: bang fai phaya nak), also known as Mekong lights, and "bung fai paya nak" by the locals, is a phenomenon said to be often seen on the Mekong River.

In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe.

In physics, a unified field theory (UFT), occasionally referred to as a uniform field theory, is a type of field theory that allows all that is usually thought of as fundamental forces and elementary particles to be written in terms of a single field.

Cold fusion is a hypothesized type of nuclear reaction that would occur at, or near, room temperature.

The Arrow of Time, or Time's Arrow, is a concept developed in 1927 by the British astronomer Arthur Eddington involving the "one-way direction" or "asymmetry" of time.

In the Standard Model of particle physics, the Higgs mechanism is essential to explain the generation mechanism of the property "mass" for gauge bosons.

Inertial confinement fusion (ICF) is a type of fusion energy research that attempts to initiate nuclear fusion reactions by heating and compressing a fuel target, typically in the form of a pellet that most often contains a mixture of deuterium and tritium.

The shape of the universe is the and of the Universe, in terms of both curvature and topology (though, strictly speaking, the concept goes beyond both).

An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.

Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.

This is a list of the different types of particles found or believed to exist in the whole of the universe.

M82 X-2 is an X-ray pulsar located in the galaxy Messier 82, approximately 12 million light-years from Earth.

The Hessdalen lights are unexplained nocturnal lights observed in a 7.

Quantum computing studies theoretical computation systems (quantum computers) that make direct use of quantum-mechanical phenomena, such as superposition and entanglement, to perform operations on data.

Ball lightning is an unexplained atmospheric electrical phenomenon.

13 Things That Don't Make Sense is a non-fiction book by the British writer Michael Brooks, published in both the UK and the US during 2008.

("God Particle" redirects here. For the upcoming sci-fi film, see God Particle (film).) The Higgs boson is an elementary particle in the Standard Model of particle physics.