DROP ZONE NASA scientists have developed a better way to get from space to the Martian surface: a “sky crane.” Bob Sauls
PopSci - On August 5, NASA’s Mars Science Laboratory will reach the outer edge
of the Martian atmosphere. The 8,500-pound craft will have traveled 352
million miles at speeds of up to 13,200 mph, but its real work will
have only just begun. Over the next seven minutes it will plummet
through 80 miles of atmosphere, withstanding temperatures of up to
3,800°F, and guide itself to a sudden halt in the massive Gale Crater.
The MSL is the most ambitious Mars project to date. Its rover, named
Curiosity, is twice as long and five times as heavy as its predecessors,
Spirit and
Opportunity.
Its 150-square-mile landing zone is a third of the size of that of
previous missions, requiring unprecedented accuracy. And whereas the
previous rovers traveled less than a mile during their three-month-long
primary missions,
Curiosity will drive up to 12 miles over the course of a full Martian year, which lasts 687 Earth-days.
The MSL’s objective is to determine if Mars has—or ever had—the
conditions necessary to support life. And it will do so with the most
advanced set of scientific tools included on any off-Earth expedition.
The MSL is more than just a Mars mission, though. It is also a test of
several newly developed devices and techniques that will drive NASA
projects for decades to come, from expeditions to the Jovian ice moon
Europa to manned missions to Mars.
SEVEN MINUTES OF TERROR
Five of the 11 missions that have reached the Martian atmosphere have
failed during the entry, descent and landing (EDL) stage, which is why
engineers nicknamed the process “seven minutes of terror.” For the MSL
mission, researchers rethought how spacecraft undertake EDL. They
replaced ballistic entry with a more accurate guided-entry system and
developed a new landing method—the sky crane—that could become standard
on large rover missions.
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