Space Age - Dawn Spacecraft - Orbiting Asteroid Vesta

Space Age - Deep Impact - First Comet Impact

Space Age - Mars Reconnaissance Orbiter - Studying Mars from Orbit

Space Age - Rosetta - First Craft to Orbit a Comet

Space Age - MESSENGER - Mercury Orbiter

Space Age - Huygens - First Landing in the Outer Solar System

Space Age - Mars Exploration Rovers - Exploring the Surface of Mars

Space Age - Hayabusa - Collecting Sample from an Asteroid

Space Age - Genesis - Sampling the Solar Wind

Space Age - Stardust - Sample of a Comet Returned

Historical Astronomy

Space Age - Voyager 1 - Exploring Interstellar Space

Space Age - Near - Shoemaker - Exploring the Asteroids

Middle Ages - Zu Chongzhi - Determining Pi Accurately

Space Age - Compton Gamma Ray Observatory - High Energy Astronomy

Space Age - Magellan - Radar Mapping of Venus

Space Age - Mir - The First Modular Space Station

Space Age - Cassini - An Orbiter Around Saturn

Claudius Ptolemy

Early Astronomy - Claudius Ptolemy - The Geocentric Universe

Early Astronomy - Hypatia of Alexandria - The Earliest Woman Scientist

Wang Chong

Early Astronomy - Wang Chong - The Nature of the Sun and Moon

Space Age - Viking 1 & 2 - First Successful Landers on Mars

Space Age - Mars 4-7 - Early Soviet Attempts to Explore Mars

Space Age - Apollo 4-6 - Lunar Program: Unmanned Test Flights

Sandra Faber

20th Century - Sandra Faber - Discovering the Great Attractor

Carl Sagan

20th Century - Carl Sagan - Planetary Astronomy and Cosmos

20th Century - Vera Rubin - Discovery of Dark Matter

Halton Arp

20th Century - Halton Arp - Peculiar Galaxies

Fred Hoyle

20th Century - Fred Hoyle - The Steady State Theory

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