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General

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Dictionary

Sun : (1) the luminous celestial body around which the earth and other planets revolve, from which they receive heat and light, which is composed mainly of hydrogen and helium, and which has a mean distance from earth of about 93,000,000 miles (150,000,000 kilometers), a linear diameter of 864,000 miles (1,390,000 kilometers), and a mass 332,000 times greater than earth (2) a celestial body like the Sun — Webster

Oxford, OneLook, Free Dictionary, Wiktionary, InfoPlease, Word Reference, Urban Dictionary

Thesaurus

Roget’s II (Thesaurus.com), Merriam-Webster Thesaurus, Visuwords

Glossary

Solar Physics Glosary (NASA)

Encyclopedia

The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Earth. Its diameter is about 109 times that of Earth, and its mass is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System. About three quarters of the Sun’s mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.

The Sun is a G-type main-sequence star (G2V) based on its spectral class. As such, it is informally referred to as a yellow dwarf. It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became so hot and dense that it eventually initiated nuclear fusion in its core. It is thought that almost all stars form by this process.

The Sun is roughly middle-aged; it has not changed dramatically for more than four billion years, and will remain fairly stable for more than another five billion years. After hydrogen fusion in its core has diminished to the point at which it is no longer in hydrostatic equilibrium, the core of the Sun will experience a marked increase in density and temperature while its outer layers expand to eventually become a red giant. It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury and Venus, and render Earth uninhabitable. — Wikipedia

Britannica, Columbia (Infoplease)

Introduction


Sun in Depth (NASA)

Search

WolframAlpha, DuckDuckGo

Preservation

History

Voyages to the Sun (Steven J. Dick, NASA’s Chief Historian)
Missions to Study the Sun (Planetary Society)

Quotation

Quotations Page Bartlett’s

Library

WorldCat, Library of Congress, UPenn Online Books, Open Library

Participation

Education

Course

OER Commons: Open Educational Resources
Open Education Consortium

Community

Blog

WordPress

News

Space Weather Live, News about the Sun (NASA), NPR Archives

Book

ISBNdb

Government

Space Weather Prediction Center (NOAA)

Document

USA.gov

Expression

Fun




Arts

The top 10 suns in art (The Guardian)

Poem

OEDILF: The Omnificent English Dictionary In Limerick Form

returntotop

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Space Weather Live
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