Browse Reference Articles
151 to 160 of 191 articles
-
Planetary nebula
A planetary nebula is an astronomical object consisting of a glowing shell of gas and plasma formed by certain types of stars at the end of their lives. They are in fact unrelated to planets; the ... > more -
General relativity
General relativity (GR) is the geometrical theory of gravitation published by Albert Einstein in 1915. It unifies special relativity and Sir Isaac Newton's law of universal gravitation with the ... > more -
Water rocket
Water rockets are like their model rocket cousins, except that these are powered by a combination of water and air pressure instead of a chemical propellant. The pressure vessel, the engine of the ... > more -
Solar radiation
Solar radiation is radiant energy emitted by the sun, particularly electromagnetic energy. About half of the radiation is in the visible short-wave part of the electromagnetic spectrum. The other ... > more -
Model rocket
Model rocketry is a hobby similar to building model airplanes. In the hobby today, there are two distinct areas of rocket activity: amateur (or experimental) rocketry, and model rocketry (including ... > more -
Phase (matter)
A phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i.e. density, crystal structure, index of refraction, and so ... > more -
Introduction to quantum mechanics
Quantum mechanics is a physical science dealing with the behaviour of matter and energy on the scale of atoms and subatomic particles / waves. It also forms the basis for the contemporary ... > more -
Hyperbolic geometry
In mathematics, hyperbolic geometry is a non-Euclidean geometry, meaning that the parallel postulate of Euclidean geometry is rejected. The parallel postulate in Euclidean geometry states, for two ... > more
Search ScienceDaily
Number of stories in archives: 137,379

