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Section 22 · Collectibles

Space & science

Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos, using mathematics, physics, and chemistry to explain their origin and overall evolution. It is one of the few sciences in which amateurs play an active role, especially in the discovery and observation of transient events, and amateur astronomers have helped with important discoveries such as finding new comets. Source

Picture: NASA/Crew of Expedition 22 · Public domain · Wikimedia Commons

The essentials

Checked against Astronomy. Source

Cosmology

Branch studying the universe as a whole

Amateur astronomers

One of few sciences where they play an active role

Stonehenge

Archaeological evidence of pre-historic interest

Nebra sky disc

Artefact inlaid with sun, moon and stars

Nabta Playa

Megalithic calendar structures in Upper Egypt

Saros cycle

223 synodic months, Babylonian eclipse discovery

Heliocentric model

Proposed by Aristarchus of Samos

Antikythera mechanism

Early analog computer, c. 150–80 BC

Almagest

Ptolemy's 13-volume work in Arabic translation

Andromeda Galaxy

Described in 964 by Abd al-Rahman al-Sufi

Uranus

First new planet found, by William Herschel in 1781

Stellar parallax

Technique developed by Friedrich Bessel in 1838