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Pallas
On 28 March 1802, the German astronomer Heinrich Olbers ...
Perseids
The Perseids form a flow of shooting stars that appear to ...
Phases of a planet
In astronomy, the phases of a planet or natural satellite ...
Plutoid
Since June 2008, following a decision by the International ...
Proton-proton chain
The proton-proton chain is one of the series of main ...
Proxima Centauri
Proxima Centauri is the nearest star to us. It is a red ...
