Astronomy is the Scientific Study of Matter in Outer Space
Astronomy is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation). Astronomy is defined as the scientific study of matter in outer space; particularly the positions, dimensions, distribution, motion, composition, energy, and evolution of celestial bodies (planets, stars) and other phenomena . Astronomy is one of the oldest sciences.
Stars were proven to be similar to the Earth's own Sun, but with a wide range of temperatures, masses, and sizes. Stars are primarily made of hydrogen, smaller amounts of helium, and trace amounts of other elements. Star formation occurs in dense regions of dust and gas, known as giant molecular clouds. Astronomers feel confident SN 1987A left behind a rapidly spinning neutron star. The word astronomy literally means "law of the stars" (or "culture of the stars" depending on the translation) and is derived from the Greek, astronomia, from the words (astron, "star") and (nomos, "laws or cultures"). The Earth was believed to be the center of the universe with the Sun, the Moon and the stars rotating around it. The distance to a star was first announced in 1838 when the parallax of 61 Cygni was measured by Friedrich Bessel. Historically, accurate knowledge of the positions of the Sun, Moon, planets and stars has been essential in celestial navigation. Modern astronomy has also discovered many exotic objects such as quasars, pulsars, blazars, and radio galaxies, and has used these observations to develop physical theories which describe some of these objects in terms of equally exotic objects such as black holes and neutron stars. Theoretical astronomers use a wide variety of tools which include analytical models (for example, poly tropes to approximate the behaviors of a star) and computational numerical simulations.
Solar System (Planetary)Objects with the Earth's solar system, including the Sun, planets, comets, and asteroids. During the 1990s, the astrometric technique of measuring the stellar wobble was used to detect large extra solar planets orbiting nearby stars. This astronomical field examines the assemblage of planets, moons, dwarf planets, comets, asteroids, and other bodies orbiting the Sun, as well as extra solar planets. A solar wind of plasma particles constantly streams outward from the Sun until it reaches the helio pause. The solar system is subdivided into the inner planets, the asteroid belt, and the outer planets. The solar system has been relatively well-studied, initially through telescopes and then later by spacecraft.
Astronomy isn't cheap, but it is rewarding. Astronomy is the study of everything outside of the earth's atmosphere and their chemical and physical properties. Astronomy was clearly a subject of major practical importance in sorting out the mess of these calendars and so observations began to be made to enable better schemes to be devised. Astronomy is a science that studies everything outside of the earth's atmosphere, such as planets, stars, asteroids, galaxies; and the properties and relationships of those celestial bodies.