ion
Usually, an atom possesses as many electrically positive protons in its nucleus as it has electrically negative electrons in its shell, rendering it, overall, electrically neutral. Atoms that have more or fewer electrons and are thus, as a ...
International Space Station
Space station in an earth orbit, constructed as a cooperative project of 16 different nations. In the context of relativity, its main reason is to be an example for a laboratory in free fall in the earth’s gravitational field. ISS pages ...
intergalactic medium
A thin gas that fills some parts of the empty regions between galaxies. The distribution is non-uniform; filaments of intergalactic medium are separated by voids with much lower density. The main ingredient of the intergalactic medium is ionized hydrogen, in ...
interferometric detector
Gravitational wave detector that utilizes interference between light waves to detect minute changes in distance effected by a passing gravitational wave. Some of the physics behind interferometric detectors can be found in our spotlight topic Catching the ...
interference
When waves meet and are superimposed, they can amplify or dampen each other. These superposition effects are called interference effects: Wherever a wave-crest meets a wave-crest, a higher wave-crest results (constructive interference); when a wave-crest ...
interaction
Interactions are all the different ways in which elementary or compound particles can influence each other. In elementary particle physics, "interaction" and "force" are used synonymously. In the standard model of elementary particles, there ...
INTEGRAL
Satellite launched in 2002 as a space-borne gamma ray observatory by the European Space Agency. Public outreach pages of the INTEGRAL ...
