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Astronomy is the oldest of the natural sciences, dating back to antiquity, with its origins in the religious, mythological, and astrological practices of pre-history: vestiges of these are still found ...
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Celestial mechanics is the branch of astronomy that deals with the motions of celestial objects. The field applies principles of physics, historically classical mechanics, to astronomical objects such ...
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Aristotelian physics is a form of natural science described in the works of the Greek philosopher Aristotle (384?322 BCE). In the Physics, Aristotle established general principles of change that gover ...
Scientist
Sir George Howard Darwin KCB FRS (9 July 1845 – 7 December 1912) was an English astronomer and mathematician.
Scientist
Lee Felsenstein (born 1945) is an American computer engineer who played a central role in the development of the personal computer. He was one of the original members of the Homebrew Computer Club and ...
Definition
A protostar is a large mass that forms by contraction out of the gas of a giant molecular cloud in the interstellar medium. The protostellar phase is an early stage in the process of star formation. F ...
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Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar energy technologies include solar heating, solar ...
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Algae are a very large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms, such as the giant kelps that grow to 65 meters in length. Most are ...
Definition
In philosophy and logic, the term proposition refers to either (a) the "content" or"meaning" of a meaningful declarative sentence or (b) the pattern of symbols, marks, or sounds th ...
Wikipedia Article
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth ...
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