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 general, a datum line is a tool used by engineers to ensure the accuracy of measurements. Engineers use the datum line as a horizontal base line to exactly measure various heights. Datum lines are valuable in the development of railway plans, as well as other complex engineering drawings.