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The distinction is that the "0.1 meter per Earth year" rate is for the big mounds of sand (the dunes), and the "several meters over 105 Earth days" is for the ripples on top of the dunes.
The measurements, which were taken 105 Earth days apart, showed that dunes moved with an average speed of 0.1 meter per Earth year. Although that migration rate is one-tenth to one-hundredth the speed of terrestrial dunes with comparable heights, the average rate of sand transport--the volume of sand moved over a certain distance in a certain time--is about equal to that of dunes in Victoria Valley, Antarctica, the team reported in the May 17th Nature.
6, 2013 -- one Earth year after the rover landed on Mars -- NASA engineers programmed the rover to vibrate its soil analysis unit to the tune of "Happy Birthday."
But Hanlon writes on page 196, "by March the rovers' predicted lifespans had been increased to eight months." As I write this review in January 2005, the rovers have thrived on Mars for a full Earth year (March issue, page 40), and they're still going strong.
While the solar-powered rover will perambulate the rocky terrain of&nbsp;Mars, drill through the surface to collect samples, and look for signs of organic material and the possibility of life - extant or extinct - the surface platform will, over the course of one Earth year, investigate the environment at the landing site.
&nbsp;- the surface platform will, over the course of one Earth year, investigate the environment at the landing site.
For Chinese women holding a strog commitment to traditional beliefs, those who were born in an earth year and developed cancer died 3.3 years earlier than other Chinese cancer victims.