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Astronomy (Greek: αστρονομία = άστρον + νόμος, astronomia = astron + nomos, literally, "law of the stars") is the science of celestial objects (e.g., stars, planets, comets, and galaxies) and phenomena that originate outside the Earth's atmosphere (e.g., auroras and cosmic background radiation). It is concerned with the evolution, physics, chemistry, and motion of celestial objects as well as the formation and development of the universe. Astronomical observations can be used to test fundamental theories in physics, such as general relativity. Theoretical astrophysics complements observational astronomy in that it seeks to explain astronomical phenomena.
Astronomy is one of the oldest sciences. Astronomers of ancient Greece practiced a scientific methodology, and advanced observation techniques may have been known much earlier (see archaeoastronomy). Historically, amateur astronomers have contributed to many important astronomical discoveries, and astronomy is one of the few sciences where amateurs can still play an active role, especially in the discovery and observation of transient phenomena.
Modern astronomy is not to be confused with astrology, the belief system that claims human affairs are correlated with the positions of celestial objects. Although the two fields share a common origin, they are fundamentally different: astronomers employ the scientific method, whereas astrologers do not.
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Gah! I'm not ready for this test also my book is missing chapters. I hate astronomy.
Ghrite (Michael Deck) Wed, 04 Nov 2009 19:34:54 -0000
Gah! I'm not ready for this test also my book is missing chapters. I hate astronomy.
Should be an astronomy major
dan_uner (Dan Uner) Wed, 04 Nov 2009 19:33:42 -0000
Should be an astronomy major
Update on problems with some light-sensing detectors in NASA's Kepler spacecraft http://tr.im/E9sD #astronomy #space #nasa
astrospacenow (AstroSpaceNow.com) Wed, 04 Nov 2009 19:33:34 -0000
Update on problems with some light-sensing detectors in NASA's Kepler spacecraft http://tr.im/E9sD #astronomy #space #nasa
@eskimoguitarist I think it's a lecture of sorts in an observatory on astronomy. :)
alexwebb93 (Alex W) Wed, 04 Nov 2009 19:27:41 -0000
@eskimoguitarist I think it's a lecture of sorts in an observatory on astronomy. :)
I hate astronomy. -.-'
isabelsvendsen (Isabel Haase) Wed, 04 Nov 2009 19:27:20 -0000
I hate astronomy. -.-'
Today is a xcore studying/hw day. I will conquer astronomy on friday.
omgahitskasey (Kasey Colucci) Wed, 04 Nov 2009 19:26:38 -0000
Today is a xcore studying/hw day. I will conquer astronomy on friday.
Astrographics Publishing - Publishes science and nature calendars, posters, gallery prints, and books.
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Astronomical League Sales - A variety of astronomy merchandise, including Astronomical League Observer books.
Astroshops - Offers Science Art Company products such as the mechanical models of the solar system called orreries.
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CAPMart - Aerospace educational materials, models, and gifts for sale.
Celestial Products - Astronomical calendars, moon calendars, Hubble Space Telescope images, posters, starfinders/planispheres, atlases, books, charts, and gifts for all ages of the scientifically curious.
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Chart Markers And More - Accessories for use at star parties.
Easy Entertainment Pictures-Wall Decor - Large interior wall hanging art decor of NASA Hubble Telescope photos.
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Everything in the Universe - Develops and sells its own unique astronomical and Oriental goods and services.
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Indigo Night Graphics - Night sky posters customized for specific date, time and location.
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Moon Charts - Show phase of the Moon for every day of the year.
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Optics for You - Telescopes and accessories.
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Radio Astronomy Supplies - International supplier of products for radio astronomy.
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Sky Image Lab - Offers large format astronomy images and photos from NASA.
Meta Description: [ Astronomy Photos from the Hubble Space Telescope, Hubble, NASA, ESO, Chandra, Gemini and Apollo mission archives. Images of space, earth, planets, stars, galaxies, nebula. High resolution digital lab for astro imagers and astro photographers. ]
Space And Astronomy - Offers books, posters, and videos.
Meta Description: [ Space And Astronomy Online Store supplies the latest space and astronomy books, posters, videos and other products. Visit our secure store for out of this world products and hassle free shopping. ]
Space Toys - Offers a very large collection and variety of toys and replicas.
Meta Description: [ Space Toys has NASA Astronauts, Space Suits, Apollo Rockets and Space Shuttles for Kids, Collectors or Museums. ]
Star Magic - Space age gifts, toys, and gizmos.
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