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Gravitation. they show that the earth's gravity field looks more like a potato than a sphere in this model gravitation is stronger in the areas that protrude and that has a lesser effect in the deps the satellites found the deepest indentation close to southern india if our friend peter usually weighs in at eighty kilos he would weigh twenty four grams less there. gravity also sinks according to a locations distance from the center of the earth. that's why peter weighs a bit more at a low lying beach. than on a mountain that's thousands of metres high but he won't notice the difference. moveme...

Back to earth. >> they knew when but not where it would land. this morning we are now told it completely disintegrated upon reentry. we have a report on the wait and the worry. >> reporter: it's a galactic heads up. scientists say the satellite had fallen back to earth. the problem is, nobody knows exactly where. >> we cannot say when reentry will happen. >> goce launched in 2009 studying earth's gravity field. but now it is out of gas. another piece of spiraling space junk. nasa estimates we are surrounded by 20,000 pieces larger than a softball zipping along at 17,000 miles an hour. causing ...

-- the web. we begin in south carolina this evening with a fast-change republican presidential race. fast as in overnight. our new cnn time orc poll tonight shows mitt romney leading here by 10 points. 33% for the former massachusetts governor to 23% for the former house speaker newt gingrich. but, and this is important, the final 24 hours of our polling suggest a gingrich surge. my sources in several republican campaigns tell me tonight their numbers, too, are detecting a significant shift, a shift that benefits gingrich heading into the final hours here. want proof? a senior romn...

Shuttle? >> yes, and jon, the reason that the convoy stays back a little bit is they have to test the air, sniff the air around the orbiter, make sure the fuel used during reentry is not drifting away from the shuttle and once that's verified they can move in and connect air conditioning systems and get the crew some cabin cooling and soon after that their van will pull up, they'll transfer it to a medical facility that drives up to the shuttle and get a quick checkup. >> how is that crew feeling now? they been in space almost two weeks, they're back feeling the forces of gravity. what does th...