Quantum
In physics, a quantum (plural: quanta) is the minimum amount of any physical entity involved in an interaction. The fundamental notion...
Galaxy
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is...
Universe
The Universe is all of time and space and its contents. It includes planets, moons, minor planets, stars, galaxies, the contents of...
Definition
Science fiction is difficult to define, as it includes a wide range ofsubgenres and themes. Author and editor Damon Knight summed up the...
