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Astronomy Science of the stars study Exams College University

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Astronomy Study of the sky and the stars Faculty

Astronomy is the World's Oldest Science -

Astronomy is the study of the sun, moon, stars, planets, comets, gas, galaxies, gas, dust and other non-Earthly bodies and phenomena. NASA defines astronomy as simple "the study of stars, planets and space." Astronomy and astrology were historically associated, but astrology is not a science and is no longer recognized as having anything to do with astronomy.

Historically, astronomy has focused on observations of heavenly bodies. It is a close cousin to astrophysics. Succinctly put, astrophysics involves the study of the physics of astronomy and concentrates on the behavior, properties and motion of objects out there. However, modern astronomy includes many elements of the motions and characteristics of these bodies, and the two terms are often used interchangeably today.

Observational astronomers focus on direct study of stars, planets, galaxies, and so forth.
Theoretical astronomers model and analyze how systems may have evolved.
Planetary astronomers (also called planetary scientists) focus on the growth, evolution, and death of planets.
Stellar astronomers turn their eyes to the stars, including the black holes, nebulae, white dwarfs and supernova that survive stellar deaths.
Solar astronomers spend their time analyzing a single star — our sun.
Galactic astronomers study our galaxy, the Milky Way, while extragalactic astronomers peer outside of it to determine how these collections of stars form, change, and die.
Cosmologists focus on the universe in its entirety, from its violent birth in the Big Bang to its present evolution, all the way to its eventual death. Astronomy is often (not always) about very concrete, observable things, whereas cosmology typically involves large-scale properties of the universe and esoteric, invisible and sometimes purely theoretical things like string theory, dark matter and dark energy, and the notion of multiple universes.
Astrometry, the most ancient branch of astronomy, is the measure of the sun, moon and planets. The precise calculations of these motions allows astronomers in other fields to model the birth and evolution of planets and stars, and to predict events such as eclipses meteor showers, and the appearance of comets. According to the Planetary Society, "Astrometry is the oldest method used to detect extrasolar planets," though it remains a difficult process.


Astronomy is the scientific study of all objects beyond our world. The word comes to us from the ancient Greeks, and is their term for "star law", It is also the science that allows us to apply physical laws to help us understand the origins of our universe and the objects in it. Both professional and amateur astronomers have interests in understanding what they observe, although at different levels.



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