#physics
Sound is the result of vibrations that propagate through a medium such as air, water, or solid materials. In space, there is no air, and thus no... Read more
Einstein's theory of relativity is one of the most significant scientific breakthroughs in history. Prior to Einstein's theory, the prevailing view... Read more
Redshift and blueshift are two important concepts in physics and astronomy. They are related to the Doppler effect, which is the change in the... Read more
The sun is a main sequence star, which means that it is in a stable phase of its evolution. However, as it continues to burn hydrogen in its core, it... Read more
String theory is a theoretical framework in physics that attempts to unify all known forces and particles in the universe. It posits that the... Read more
The theory of relativity is a set of two interrelated physical theories proposed by Albert Einstein. The first one, called special relativity, was... Read more
Planetary nebulae and HII regions are two types of nebulae found in space. Planetary nebulae are formed by the ejected outer layers of dying low to... Read more
Light travels through space in a straight line at a constant speed of 299,792 kilometers per second (or approximately 186,282 miles per second).... Read more
According to Einstein's theory of special relativity, the speed of light is the universal speed limit. This means that nothing can travel faster than... Read more
General relativity is a theory of gravity, but it is distinct from other theories of gravity in several key ways. The theory was developed by Albert... Read more