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buy norfloxacin online Yet finding more complex organic compounds could be challenging. These molecules, such as the amino acids that build life's proteins, are not very hardy: radiation from the sun easily breaks them apart. "How the organics are actually preserved and what happens after the radiation hits them is something we're going to have to explore further," Eigenbrode said. Even if Mars did have ancient life, fossil evidence might not necessarily survive. The lake might have existed billions of years ago; on Earth, which is teeming with life, it is rare to find microfossils from that far back, Grotzinger said. "The trick is to make sure you have enough of the good minerals and as little as possible of the bad radiation that will vaporize them."