Mars is 250 million miles from Earth at the farthest point in the planets' orbits. Sheer distance makes unpredictable weather, unexpected illness and even homesickness potentially deadly problems. Residents of the future Mars base won't be able to count on a rescue mission.
For other Devil's Trumpet, see Datura (disambiguation). Datura is a genus of nine species of poisonous vespertine flowering plants belonging to the family Solanaceae. They are commonly known as daturas, but also known as devil's trumpets, not to be confused with angel's trumpets, its closely related genus Brugmansia.
In surveying and geodesy, a datum is a set of reference points on the earth's surface against which position measurements are made, and (often) an associated model of the shape of the earth (reference ellipsoid) to define a geographic coordinate system.orizontal datums are used for describing a point on the earth 's surface, in latitude and longitude or another coordinate system. Vertical datums measure elevations or depths. In engineering and drafting, a datum is a reference point, surface, or axis on an object against which measurements are made.