Vanishing Act Phoenix Mission Team, NASA, JPL-Caltech, U. Arizona, Texas A&M University
Explanation: Compare these two close-up pictures taken on sol 20 (left) and sol 24 of a trench dug in the Martian surface by NASA's Phoenix Lander. Those sols of the Phoenix Mission (a sol is a Martian day), correspond to June 15 and 18 on planet Earth. Light-colored, dice-sized chunks, visible in the lower left shadow region of the trench in the sol 20 image have vanished by sol 24 -- a strong indication that the chunks were ice uncovered by digging the shallow trench. The vanishing act likely demonstrates the sublimation of ice in the trench, a process similar to evaporation, in which the ice went directly from solid to gas after it was exposed to sunlight and the thin, dry Martian atmosphere.
Explanation: Compare these two close-up pictures taken on sol 20 (left) and sol 24 of a trench dug in the Martian surface by NASA's Phoenix Lander. Those sols of the Phoenix Mission (a sol is a Martian day), correspond to June 15 and 18 on planet Earth. Light-colored, dice-sized chunks, visible in the lower left shadow region of the trench in the sol 20 image have vanished by sol 24 -- a strong indication that the chunks were ice uncovered by digging the shallow trench. The vanishing act likely demonstrates the sublimation of ice in the trench, a process similar to evaporation, in which the ice went directly from solid to gas after it was exposed to sunlight and the thin, dry Martian atmosphere.
3 comments:
Já estragámos um, agora estamos a tentar ir estragar o próximo...
Nao concordo consigo, Cara Amiga, quanto a este ponto.
Ha aspectos negativos na aventura da actividade cientifica da humanidade? Claro que ha.
Mas nem a curiosidade humana pode ser estancada nem o imobilismo serve a condicao humana.
Com muita simplicidade, era o que dizia Antonio Aleixo:
"Quem prende o ribeirinho que corre
É por si mesmo enganado.
O ribeirinho não morre,
Vai correr por outro lado."
Estava a brincar. Uma piada azeda a condizer com os dias que correm.
Concordo completamente consigo, a curiosidade, o desejo de entender o que o rodeia é o caracteriza fundamentalmente a espécie humana e reprimir isso seria a nossa destruição.
Não ligue! Hoje estou, como dizia a minha avó, 'com a macaca' (não me pergunte de onde vem a expressão) ou seja, nervosa e revoltada com as noticias que leio.
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