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Thursday 25 December 2008
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Defintion of Astronomy
Science dealing with the origin, evolution, composition,
distance, and motion of all bodies and scattered matter in the universe. The
most ancient of the sciences, it has existed since the dawn of recorded
civilization. Much of the earliest knowledge of celestial bodies is often
credited to the Babylonians.
The ancient Greeks introduced influential cosmological
ideas, including theories about the Earth in relation to the rest of the
universe. Ptolemy's model of an Earth-centred universe (2nd century AD)
influenced astronomical thought for over 1,300 years. In the 16th century,
Nicolaus Copernicus assigned the central position to the Sun (see Copernican
system), ushering in the age of modern astronomy.
The 17th century saw several momentous developments:
Johannes Kepler's discovery of the principles of planetary motion, Galileo's
application of the telescope to astronomical observation, and Isaac Newton's
formulation of the laws of motion and gravitation. In the 19th century,
spectroscopy and photography made it possible to study the physical
properties of planets, stars, and nebulae, leading to the development of
astrophysics.
In 1927 Edwin Hubble discovered that the universe, hitherto
thought static, was expanding (see expanding universe).
In 1937 the first radio telescope was built. The first
artificial satellite, Sputnik, was launched in 1957, inaugurating the age of
space exploration; spacecraft that could escape Earth's gravitational pull
and return data about the solar system were launched beginning in 1959 (see
Luna; Pioneer). See also big bang; cosmology; gamma-ray astronomy; infrared
astronomy; radio and radar astronomy; ultraviolet astronomy; X-ray
astronomy.<
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About Me
- Sumit Arora
- I am the person with creativity, colorful thoughts,joyful creations and intrinsic impression. practical philosophy fine with me, but keep the great idea for execution then in virtual. Want be a bird, so that I can fly across the land, I can see the nature, history,culture,human beings and merge myself with them. More updation will happen soon.
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