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Feb 14 → Apr 16, 4:27
Stellare		UN International Year of Planet Earth · 3
Sir Arthur C. Clarke made a great contribution to the UN International Year of Planet...
Dec 10 → Jan 14, 4:59
Stellare		Welcome to an exciting new experience! · 3
I need to know what vertical surveying methods you use in order to give a precise ans...
Dec 9 → Dec 12, 2:56
Stellare		Earth trajectory change · 4
The Earth is orbiting around the sun due the gravitational force from the suns vast m...