Klik på en miniature for at gå til Google Books
Indlæser... The Rock from Mars: A Detective Story on Two Planetsaf Kathy Sawyer
Ingen Indlæser...
Bliv medlem af LibraryThing for at finde ud af, om du vil kunne lide denne bog. Der er ingen diskussionstråde på Snak om denne bog. If you've been reading my reviews for the Journal of Chemical Education, you might remember something about this rock, ALH84001, because the publication in Science of the paper that announced evidence in a meteorite that life had once existed on Mars was my Pick back in August of 1996. The article was controversial, as you might expect. How do we know this rock, found in the ice of Antarctica, really came from Mars? How do we know that the critical isotopic ratios of its carbonates are the result of life, rather than inorganic processes? How do we know that it has not been altered during its time on earth? Many of these questions were raised ten years ago, and even more have beleaguered the authors since then. The story is much longer, richer, and more even more interesting than it first appeared. I recommend this book for students and teachers of science because Kathy Sawyer does such a good job of describing the adventure, the personalities, the political considerations, and the controversy surrounding this chunk of rock. It could easily inspire students to become scientists because it shows so clearly how the processes of science (including heated arguments) actually operate. ( ) ingen anmeldelser | tilføj en anmeldelse
Sixteen million years ago, an asteroid crashing into Mars sent fragments flying into space and, eons later, one was pulled by the Earth's gravity onto the icy wilderness of Antarctica, where a geologist spotted it. In its new home at NASA's Johnson Space Center in Houston, the rock languished on a shelf for nine years. Then, in 1993, a geochemist unmasked the rock as a Martian meteorite. Before long, possible signs of once-living organisms were detected, and the obscure rock became a rock star. From the second the story broke in Science magazine, it spawned waves of excitement, envy, competitive zeal, and calculation. The narrative traces the steps that led to this risky move and follows the rippling impact on the scientists' lives, the future of space exploration, the search for life on Mars, and the struggle to understand the origins of life on Earth.--From publisher description. No library descriptions found. |
Current DiscussionsIngen
Google Books — Indlæser... GenrerMelvil Decimal System (DDC)576.8Natural sciences and mathematics Life Sciences, Biology Genetics and evolution EvolutionLC-klassificeringVurderingGennemsnit:
Er det dig?Bliv LibraryThing-forfatter. |