Thank y f d f t B. F d o o c r o p a o t o u, g t bbcworldservice.com/podcasts. / This i S i Action f t B. I'm John S. C u, t challenge o c a t s i t world / probably b e, a. / B despite o d / n o possible, b c. M coming u. B first; w's b b / t strongest e y t M / may h b, o e may b, h t l, / some s / general / m b l / perception / life f / science c, it's p w accepted t, i w f a a a, it's l t b microbio a v s l, i anything h e e. / S, n l g m / planetary g J M s, / t red p, w n seems d, b a / hostile t l, c once h b / liquid w o t s. T p / incredibly w-s a d / n just t t high p r / l N's Curiosity, b a / H r published i / information f N a E o, t propose e o life-g w a t M c. / W d a global s o a sorts o d b o M. S, those a w m / impact t surface / big h i t ground / t b w o m expect / lake w t a, o ground w t c f t sub-surface. T a t p w y a e t l. So, w w looking i areas w w t m b / likely t f e / like g w / r t surface, a / M crater, w d f t kind o e using d f t M r orbitor. T's a i o t space-craft c C, a w i d / i sees / i i light / i t capability o / a s o differenciate t o minerals. T e w w d h. We've i specific c minerals, a m c / i t f o water, a / l rocks w t s basin t suggest t t f i a lake. / S, it i r t y a seeing n. / a dry c. Uh, how d you / give y e i t y c say t t m h b formed i a l u w? / number o / t conclude t t w, i f, a lake. One o t i t there a s c i t wall o t c / river c / f f outside / within t c only. B t all t at a level __ about / above t m f of t basin. S, o m i t t w t s / that w / surface / S, that's o p / evidence / t other o i / themselves / c a c / minerals. W know t f f water. S, w w see h a layered / s o containing m t typically f i l e, a t a c w b / e t find a l, a, i association w t, w s / c t a terminating a a p / all t s t m / compelling s. / H l a a w t / water / w d k t exact a o t d. B i seems t t a / t a p older t 3. / billion y o. T's amazing b, o E, t oldest r t w h a a at any p o e a approximately / A, on E, very l h s t t much t, because w h p t o E / w causes t s t recycle i. Therefore, v ancient r g d s a very l / have b mingled a m u b plate t, a over-p b o c processes, s t, f g, it's very d t interpret t t, t m, t chemistry o those r. These r o Mars a older t t. A t i / one r why I f exploration o M i n o i, it's essential. I / on E, w ultimately m l b E. W m l a / older t w i available t u h. / S, you've been d a t o / so f from s orbiting M. W do h t h-p l o Mars / NASA's c r ... i t / looking a s different? / T truth i, w y l d a G c / Curiosity r i c l, w y see a certain t o c m, a another c o mineral c s. S i / w think a a environment. A e a n v good f preserving l o s i. B t rocks w s i t M crater s t r alkaline l s. S, v a, i a b destructive a v a, w, m a, i essentially good f l, a g f s a p i. / how f a / t two c / M a / I mean, i t a c o sending C f o t t o / investigate w y f / w t / Curiosity / q a l t / c drive a t w / definitely s t m. / Dr. J M f t N H M i London, t a t possibilities o l o M. A we'll b talking a q l o E later h o t BBC
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Source : http://www.bbc.co.uk/podcasts/series/scia scia_20130124-2032a.mp3