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Eris, in astronomy

(Encyclopedia) Eris, in astronomy, the largest known dwarf planet. Eris, whose highly eccentric elliptical orbit ranges from 38 AU to 97 AU and is inclined more than 44°, is the largest known object…

Halley, Edmond

(Encyclopedia) Halley, EdmondHalley, Edmondhălˈē, hôˈlē [key], 1656–1742, English astronomer and mathematician. He is particularly noted as the first astronomer to predict the return of a comet and…

Roundup of Recent Science Discoveries, 1999

Ancestor of Mammals Discovered The fossil skull of a 260-million-year-old sheep-sized animal was found near Williston on the Northern Cape, South Africa. It is the most primitive member yet…

DK History: Incas

GOLD MASK WHO RULED THE INCA EMPIRE? HOW DID INCA SOCIETY FUNCTION? WHO WAS DESCENDED FROM THE SUN AND MOON? FIND OUT MOREThe Inca people lived in the Andes mountains of Peru. Between the 12th…

DK Science: Telescopes

X-RAY OF BINOCULARSREFRACTING TELESCOPEREFLECTING TELESCOPEFIND OUT MOREJust as our eyes cannot see small objects, so they cannot see things that are very far off. Even when things are millions of…

eclipse: Introduction

Introduction eclipse (ēklĭpsˈ, ĭ–) [key] [Gr., = failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lunar eclipses,…

eclipse: Introduction

Introduction eclipse (ēklĭpsˈ, ĭ–) [key] [Gr., = failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lunar eclipses,…

eclipse: Introduction

Introduction eclipse (ēklĭpsˈ, ĭ–) [key] [Gr., = failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lunar eclipses,…

eclipse: Introduction

Introduction eclipse (ēklĭpsˈ, ĭ–) [key] [Gr., = failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lunar eclipses,…

Space Glossary

This page provides explanations and images of bodies throughout the universe: galaxies, solar systems, planets, nebula, stars, asteroids, comets, quasars, black holes, and more. Asteroid This…