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May 6, 2024 · Constellations were named after objects, animals, and people long ago. Astronomers today still use constellations to name stars and meteor showers. There are a few different definitions of constellations, but many people think of constellations as a group of stars. Often, it's a group of stars that looks like a particular shape in the sky and ...
2 days ago · Definition and basic properties. General relativity is a metric theory of gravitation. At its core are Einstein's equations, which describe the relation between the geometry of a four-dimensional pseudo-Riemannian manifold representing spacetime, and the energy–momentum contained in that spacetime. [46]
6 days ago · t. e. In astronomy, dark matter is a hypothetical form of matter that appears not to interact with light or the electromagnetic field. Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be seen.
May 22, 2024 · Doppler effect, the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by relative motion of the observer and the wave source. This phenomenon is used in astronomical measurements, in Mössbauer effect studies, and in radar and modern navigation.
May 17, 2024 · celestial navigation. sextant, instrument for determining the angle between the horizon and a celestial body such as the Sun, the Moon, or a star, used in celestial navigation to determine latitude and longitude. The device consists of an arc of a circle, marked off in degrees, and a movable radial arm pivoted at the centre of the circle.
May 9, 2024 · Key Differences. Reflection is a mental process where one reviews past actions, thoughts, or experiences to learn and make informed decisions. In contrast, observation is an act of gathering information through the senses, often systematically, to understand an event, behavior, or phenomenon. 5. Reflection requires time for introspection ...
A department might make a distinction between an astronomy degree and an astrophysics degree and have a slightly different course load between the two, but overwhelmingly there are "astronomy" departments and not "astrophysics" departments. I'm currently doing a PhD in astronomy, studying physical properties of young stars.
