美國之音2007標準下半年APhoenix Probe Ready for Mars Mission

所屬教程:美國之音2007標準下半年A

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Phoenix Probe Ready for Mars Mission

By Paul Sisco
Washington
13 July 2007

At a Washington news conference this week NASA scientists discussed the upcoming Phoenix mission to Mars.

The probe is scheduled for launch in the predawn hours of August third and will take 10 months to reach its target.

Project Manager Barry Goldstein explains what happens next. "On May 25th, 2008 the fun begins. We separate from the crew stage. We're traveling at about 12,600 miles an hour. We take up most of that energy with the heat shield, which is at the bottom the entry vehicle.

Unlike previous Mars probes that bounced to the surface, this one has thrusters that ignite, and cushion the landing.

Goldstein further explains, "Basically what we are dealing with is, we're dealing with a system that is coming into the planet at 12,600 miles an hour, screaming into the planet and slowing down to basically zero inside seven minutes."

Once the dust settles the solar arrays on the Phoenix deploy. The camera springs up into place, followed by instruments used to collect atmospheric data. The robotic arm on Phoenix scoops up soil samples and drops them into a sort of oven for analysis.

That is done by remote by Peter Smith's team at the University of Arizona.

"I see this mission as a stepping stone towards the search for life on other planets. We're hoping to find a place that we consider really a habitable zone on Mars. And to me if we can find that out, it will be a tremendous success on this mission."

The public is invited to join the Phoenix mission in its search for water and life on Mars by logging onto the Internet at