the meteor miised uclear ann chemical weapoo storage facilities. russian presiient putin romiied aid & for thoss affected. some small ettors strrke the artt &pevery yyar, including in the - us. bbt thiisone was noteeorthy for itss size, injjry tolla"a&and visibility. harris says: "the thhng is that it came ddwn in a populated area an industrial -3& areaaii fact. aad that is -3 maybe unusual." ((on-caa tagg) - today's inciient 3 milee west anddabout a 100 years after a west and about a 00 years after assive meeeor strike in tunguska, & siberra. that one kkocked doww millions of trees over n 800 square mile area. not a cell 3 innlondon, greg palkottfox news. 3&p hourssafter thh meteor hht & russia.. a 150 foot cosmic & earth. 3 astronomers at the goddard space flight center in & greenbelt say the two eeentt were ot relaaed. the asteroid is estimateedtt bee pfour and a hhlf billion years old. scientiits have been collecting imaags and dataaon phe asteroid since early -&pfriday morning. 3 (scienniss)"the good news is the aateroid is going to pass ssfel

this group wants more access to .uclear sites for inspection to uraniumran enrichment at five -- 5%. it is currently up to 20%. they want it to limit stockpiles of enriched uranium. iran wants the west to recognize its right of enrichment and to start to dithch the sanctions. the talks are sure to be difficult. the international community says it is bringing offers which are serious and substantial. upcoming elections to worry about. these negotiations are likely to be more of a marathon, not a sprint, but they hope that they are going in the right direction. >> tonight, an urgent operation is underway to rescue the veteran british explorer who is stuck in antarctica with severe frostbite. the adventurer, who is 68, was part of a team trying to walk across the continent in winter, something that has never been done before, but he has had to abandon the journey after what is thought to be a skiing accident at base camp. inm the adventures antarctica to hollywood. the movie world was all about the oscars. best actor honors went to daniel day-lewis for his portrayal of abraham lincoln,

kind of a hotbed for nuclear research back in the soviet era and they do have several very important uclear facilities nuclear storage facilities and one of them has actually come really close to becoming a second trouble twice already and the fact that it wasn't hit by the many falling mature pieces is just amazing so thank goodness that didn't happen absolutely absolutely but still there are some people who are saying that if history is any indication it could have been worse there are telescopes and networks of. nasa the u.s. that was kosmos and well sure the europeans those are just the others that are out there trying to detect a truck and afterwards but honestly there's a lot of there's hundreds of thousands and their biggest focus is on the really large ones ones that are hundreds of meters in diameter or kilometers in diameter that could potentially you know do do all this work up into the dinosaurs. of course you have to understand the power of the blast of the of the sonic boom when the meteor has entered the atmosphere it was actually twenty times that of the russian unimagined i

sandra: currently next generation of power in the united states 54%, natural gas 18%,uclear power thellest of 16.2%. not very popular. do you think those could change of the new technology are working on is succesul? >> it is hard to say. ultimately whether or not nuclear power is a larger proportion of our energy portfolio depends on a lot of long-term economics. natural gas is just so cheap it is hard to justify building a whole lot of nuclear plants so that question is a question that will probably be answered over the next 10 to 20 years a little difficult to predict. sandra: break this down for us. what makes the technology that you are working on different from the nuclear technology we know today? >> big differences that will be cooled by helium as opposed to being cooled by water. that gives a number of advantages, and one is more efficient which officially allows for more efficient and less waste. more importantly, it will open up the industry to a number of different markets that traditionally hasn't seen players with electricity and process steam that can be used for indust

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states they believe and negotiators believe could have .uclear capabilities i they do not have any kindnuclear program. it also includes iran. iran has this serious program to develop capabilities that will allow them to build a bomb. we estimate if they were to make a mad dash, they could do so within about a year, maybe three. then you have more advanced states like japan. japan could probably build a bomb in six months if they wanted to. it has technical capabilities, it has a design for a bomb. there are other countries that could build a bomb relatively quickly. these are in advanced industrial nations, we are not worried about the capability because they are unlikely. if you look at pictures, it is a very small set of countries we are worried about. we are down to iran and north korea. if we can stop them we could be looking at the end of proliferation, looking at the tipping point the tips away from nuclear weapons in the 21st century. host: a picture from "the washington post," reading copies of an extra edition put up by a japanese newspaper -- you can see interest in that coun