New Scientist: It’s arguably the most scrutinised piece of rock ever. Now an even closer look at a meteorite from Mars suggests it may show signs of life after all. … One area of disagreement centred around nanocrystal magnetites in the rock, some of which appear to have chemical and physical features identical to those produced by contemporary bacteria. Sceptics of the biological explanation suggested that the magnetites were created when carbonate decomposed under high pressures and temperatures, …
Even if that meteorite contains bacterial fossils, which is still dubious, how is that evidence for panspermia?
I find more likely that life could have appeared independently both on the Earth and on Mars, rather than bacteria surviving some terrible explosion jettisoning them to a transfer orbit, then many years (decades? centuries? millennia?) of travel at freezing temperature and no atmosphere and finally an uncontrolled entry in the Earth atmosphere and crash on the ground.
Can we get some details on that? How big an asteroid has to hit Earth in order to jettison a large piece of earth into space? How could life possibly survive an equivalent of a nuclear explosion at ground zero?
"May" is used at the beginning of the quote. You use "confirmed." What do you put the odds at? > 90%?
How does this affect the filter idea, and would you consider reconciling your opinion on the filter with your stated sanguine position toward human extinction?
Even if that meteorite contains bacterial fossils, which is still dubious, how is that evidence for panspermia?
I find more likely that life could have appeared independently both on the Earth and on Mars, rather than bacteria surviving some terrible explosion jettisoning them to a transfer orbit, then many years (decades? centuries? millennia?) of travel at freezing temperature and no atmosphere and finally an uncontrolled entry in the Earth atmosphere and crash on the ground.
Can we get some details on that? How big an asteroid has to hit Earth in order to jettison a large piece of earth into space? How could life possibly survive an equivalent of a nuclear explosion at ground zero?
"May" is used at the beginning of the quote. You use "confirmed." What do you put the odds at? > 90%?
How does this affect the filter idea, and would you consider reconciling your opinion on the filter with your stated sanguine position toward human extinction?
Even if that meteorite contains bacterial fossils, which is still dubious, how is that evidence for panspermia?
I find more likely that life could have appeared independently both on the Earth and on Mars, rather than bacteria surviving some terrible explosion jettisoning them to a transfer orbit, then many years (decades? centuries? millennia?) of travel at freezing temperature and no atmosphere and finally an uncontrolled entry in the Earth atmosphere and crash on the ground.
Confirmed does seem a little strong of a word...
Can we get some details on that? How big an asteroid has to hit Earth in order to jettison a large piece of earth into space? How could life possibly survive an equivalent of a nuclear explosion at ground zero?
Fascinating.
"May" is used at the beginning of the quote. You use "confirmed." What do you put the odds at? > 90%?
How does this affect the filter idea, and would you consider reconciling your opinion on the filter with your stated sanguine position toward human extinction?
Even if that meteorite contains bacterial fossils, which is still dubious, how is that evidence for panspermia?
I find more likely that life could have appeared independently both on the Earth and on Mars, rather than bacteria surviving some terrible explosion jettisoning them to a transfer orbit, then many years (decades? centuries? millennia?) of travel at freezing temperature and no atmosphere and finally an uncontrolled entry in the Earth atmosphere and crash on the ground.
Confirmed does seem a little strong of a word...
Can we get some details on that? How big an asteroid has to hit Earth in order to jettison a large piece of earth into space? How could life possibly survive an equivalent of a nuclear explosion at ground zero?
Fascinating.
"May" is used at the beginning of the quote. You use "confirmed." What do you put the odds at? > 90%?
How does this affect the filter idea, and would you consider reconciling your opinion on the filter with your stated sanguine position toward human extinction?