Keplerian telescope

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Infinite space background with silhouette of telescope. This image elements furnished by NASA.

Telescopes: Seeing Stars

Planet Earth and lunar moon from space

Where Did the Moon Come From?

solar eclipse, sun, moon, astronomy, space

How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?

Arrangement of the phases of the moon in total eclipse with Blood Moon

9 Celestial Omens

1 July 2002: The Solar and Heliospheric Observatory (SOHO) satellite reveals a massive solar eruption more than 30 times the Earth's diameter. The eruption formed when a loop of a magnetic field over the surface of the Sun trapped hot gas.

6 Questions About the Sun Answered

Discover

Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

VAN, TURKEY - OCTOBER 25: A building and car ruined during the earthquake of Van-Ercis on October 25, 2011 in Van, Turkey. It is 604 killed and 4152 injured in Van-Ercis Earthquake.

What Is an Aftershock?

Comparison of a hare and a rabbit. (Left-hare) black-tailed jackrabbit (Lepus californicus); (right-rabbit) desert cottontail (Sylvilagus audubonii)

What’s the Difference Between Rabbits and Hares?

Snowshoe hare (Lepus americanus) with its Summer coat on the left side and its winter coat on the right.

7 Animals That Turn White in Winter

A ball swishes through the net at a basketball game in a professional arena.

Why Are Basketball Hoops 10 Feet High?

The Battle of Gettysburg, July 1-3, 1863. (Civil War, Pennsylvania)

9 Worst Generals in History

Shadow of a man holding large knife in his hand inside of some dark, spooky buiding

7 of History's Most Notorious Serial Killers

Keplerian telescope: Related Content

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telescope Schmidt telescope Galilean telescope

Key People

Johannes Kepler

Johannes Kepler

German astronomer

Quiz

Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.

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