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  1. Welcome to Wikipedia. , the free encyclopedia that anyone can edit. 6,823,540 articles in English. From today's featured article. Mars is the fourth planet from the Sun. It was formed approximately 4.5 billion years ago, is a terrestrial planet and is the second smallest of the Solar System 's planets with a diameter of 6,779 km (4,212 mi).

  2. en.wikipedia.org › wiki › WikipediaWikipedia - Wikipedia

    Wikipedia is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the use of the wiki-based editing system MediaWiki. Wikipedia is the largest and most-read reference work in history.

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  3. en.wikipedia.org › wiki › EncyclopediaEncyclopedia - Wikipedia

    An encyclopedia ( American English) or encyclopaedia ( British English) [1] is a reference work or compendium providing summaries of knowledge, either general or special, in a particular field or discipline.

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