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Astronomy (Greek: ast????µ?a = ?st??? + ??µ??, astronomia = astron + nomos, literally "law of the stars") is the study of the evolution and physical and chemical properties of celestial objects. Astronomical observations are not only relevant for astronomy as such, but provide essential information for the verification of fundamental theories in physics, such as the general relativity theory. Complementary to observational astronomy, theoretical astrophysics seeks to explain astronomical phenomena.
 

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Space, (or outer space), describes the vast empty regions between planets and stars. The study of these, and other, astronomical objects is called Astronomy, one of the oldest sciences. It is often said that space exploration began with the launch of Sputnik 1, the first man-made object to orbit the Earth. Then, in an almost unbelievable feat of human achievement, in 1969 Neil Armstrong and Buzz Aldrin travelled to the Moon and set foot on the surface during the Apollo 11 mission. Recently, it has become clear that the possibility of space colonization may no longer be exclusively reserved for science-fiction stories, and many controversial issues surrounding space have come to light, including commercial spaceflight, space laws and space weapons.
 

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The Star Portal
 

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Economy of North America | United States | Northern American countries | Countries bordering the Atlantic Ocean | Countries bordering the Pacific Ocean | Countries bordering the Arctic Ocean | English-speaking countries and territories | Federal countries | Former British colonies | G8 nations | G20 nations | Liberal democracies | States and territories established in 1776 | Federal republics | Federal constitutional republics | Constitutional republics | Republics

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These are links to lists of hospitals around the world.

Lists of hospitals for each country in North America.

 

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Lists of hospitals for each U.S. state:
 

This is a list of hospitals in Mexico.

This list is incomplete; you can help by expanding it.

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