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Ancient Lenses.

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ancient-wisdom.com

Timeline of Telescopes and Lenses

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scientus.org

od National Geographic Society (blogs)

Will the Real “First Moon Mapper” Please Stand Up?

moon-map.jpg

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voices.nationalgeographic.com

Over hundreds of millions of years, life spread through the seas and over Earth’s surface. The first life-forms were small and simple. Later forms were more complicated and diverse.

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britannica.com

Informal division of Precambrian time occurring between about 4.6 billion and about 4.0 billion years ago. The Hadean Eon is characterized by Earth ’s initial formation—from the...

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britannica.com

File:Artist’s impression of two white dwarf stars merging and creating a Type Ia supernova.ogg

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en.wikipedia.org

Wide Field and Planetary Camera 2 - Wikipedia, the free encyclopedia

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en.wikipedia.org

Human Migration map

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britannica.com