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Tacchini, Pietro

Taurus, Constellation

Telescopium, Constellation

Terraforming of Mars

Terraforming of Venus

Terrestrial planet

Theophrastus (crater)

Theta Centaurids

Thome, John Macon

Todd, David Peck

Tombaugh, Clyde

Transit of Venus

Triangulum, Constellation

Triangulum Australe, Constellation

Tucana, Constellation

Tucker, Richard Hawley

Tully-Fisher relation

Turner, Herbert Hall

Tychonic system

Astronomy Encyclopedia

Hellenica World - Scientific Library