General astronomy

General astronomy

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General astronomy

intensity

Astronomy; General astronomy

the number of waves or photons reaching your detector every second.

interferometer

Astronomy; General astronomy

an array of telescopes connected electronically to act as one large telescope with much improved resolution. The resolution of the interferometer is equal to a single telescope having a diameter ...

inverse square law of light brightness

Astronomy; General astronomy

an object's apparent brightness decreases with the square of the distance. The apparent brightness is the amount of energy flowing through a given area in a given amount of time.

ion

Astronomy; General astronomy

a particle with an electrical charge (the number of electrons is different than the number of protons).

(comet): one of the two tails of a comet made of ionized particles that points directly away from the Sun from the action of the solar wind. It has a bluish color from the emission lines mostly of ...

irregular galaxy

Astronomy; General astronomy

a galaxy with no definite structure. Stars are distributed in bunches placed randomly throughout the galaxy. Many irregular galaxies have a lot of gas and dust still left in them from which stars are ...

isotope

Astronomy; General astronomy

a sub-group of an element in which the atomic nucleus has the same number of neutrons, as well as, the same number of protons. All of the atoms of an element will have very nearly the same chemical ...