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Astronomy

a stron' o mE, the science that deals with the material universe beyond the earth's atmosphere

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Pluto
Pluto
is not only the smallest planet in the Solar System, it is actually smaller in diameter than seven of the system's moons. On August 24, 2006, the International Astronomical Union reclassified Pluto as a "dwarf planet."

CONTENTS

Individual Biography, A-Z
Individual Biography, A-Z

Instruments

Practical and Spherical Astronomy
Practical and Spherical Astronomy

The Solar System
The Solar System
the Sun with all the celestial bodies that orbit around it

Stars
Stars
a hot, gaseous self-luminous celestial body, as the Sun

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