Mars Rovers Return to Exploration

inkslinger77 writes "The two Mars rovers that have been carefully conserving critical power supplies since June, when the summer dust-storm season began on the red planet, are now springing back to work as the storms subside. Typically, the solar panels on each rover produce about 700 watt-hours of electricity per day — enough to light a 100-watt bulb for seven hours, according to NASA. But this year's dust storms reduced that to as little as 128 watt hours per day. When daily power generation is down to less than 400 watt-hours, the rovers suspend their driving on the planet and stop using their robotic arms, cameras and other instruments. But they are back in action now!"

Comments

I don't think you need NASA to say that

[caluml]

each rover produce about 700 watt-hours of electricity per day -- enough to light a 100-watt bulb for seven hours, according to NASA.

I don't think you need NASA to say that - I think I can confirm that 700 watt-hours will power a 100-watt bulb (or device) for 7 hours. furthermore, improving on NASA, I can also say that it will power 7 100-watt bulbs for 1 hour, or 1 700-watt bulb for an hour.

Re:I don't think you need NASA to say that

[empaler]

But on Slashdot, uids under 20000 are only for old people! ... according to NASA.

Since it seems to come up every time

[evanbd]

The issue of whether or not to put some sort of dust-clearing device on the panels was examined critically and decided on early in this project. In short: they didn't know what dust storms would do to the panels; it turns out they tend to remove dust. Several options for dust clearing were considered -- wipers, electrostatic techniques, peel-away plastic, and probably others I've forgotten. All of them would have *probably* worked, and all of them would have taken up space and weight. Essentially it came down to choosing between dust removal and an instrument. Faced with that decision, they decided that better quality, more complete data was more interesting than having the rovers run longer.

Of course, they got lucky, and the dust storms seem to clear dust off the panels. So there was even less need for dust-clearing than they thought there might be.

Re:Next?

[paleo2002]

Are you kidding? These rovers are functioning way beyond their mission parameters. They've collected more data than anyone expected. We've gone from "What if there's water on Mars" to "How much water is there on Mars?". The rovers survived a Martian dust storm! Martian dust storms have been known to cover the entire planet.

Let's put it this way. If your car was as well-designed and resilient as these rovers it would run on empty for 100 miles, drive up mountains, and review your tax returns.