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Reference Pages

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Hubble Finds Dark Matter Ring in Galaxy Cluster

What Is Dark Matter?

Dark Energy Mystery Illuminated By Cosmic Lens

What Is Dark Energy?

night sky watching

Night Sky: Visible Planets, Moon Phases & Events, May 2013

Prime meridian

Royal Observatory: Where East Meets West

Wormhole

What Is A Wormhole?

Full Size Virgin Galactic SpaceShipTwo

Space Ship Two: On A Flight Path To Space Tourism

Percival Lowell and the Clark Telescope

Lowell Observatory: Where Pluto Was Discovered

An artist's concept illustrating an Apollo-type spacecraft (on left) about to dock with a Soviet Soyuz-type spacecraft.

Apollo Soyuz Test Project: Russians, Americans Meet In Space

Saturn moon collage

Saturn's Moons: Facts About The Ringed Planet's Satellites

Hubble Space Telescope's iconic view of the Pillars of Creation in the Eagle Nebula

Hubble Space Telescope: Pictures, Facts & History

Eugene Cernan

Eugene Cernan: Last Man On The Moon

Harrison Schmitt

Harrison Schmitt: Geologist On The Moon

Ron Evans

Ron Evans: Apollo 17 Command Module Pilot

Hyperion

Hyperion: Saturn's Spongy Moon

New Cassini photo of the Saturn moon Tethys.

Tethys: Saturn's Icy Moon

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