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Astronomy is the oldest of sciences.
Yet it remains as important today as when humans first began to understand the motions of the Sun, Moon, planets and stars. We live at a crucial phase in the history of our planet. For the first time in history, we have the power to affect, for better or worse, the nature of our planet. Modern planetary astronomy provides us with a glimpse of the diversity of other worlds, from the runaway greenhouse effect on Venus and the changing climate of Mars to the shifting ice flows on the moons of Jupiter and Saturn. Astronomy places human development in context.