Washington (AP) -- Scientists have long been debating whether there's water on Mars. Those who think there is have new evidence to back up their beliefs.
Images from a camera on a NASA orbiter show alternating layers of dark- and light-toned rock. Within are a series of fractures, surrounded by what researchers call "halos" of light-toned bedrock. Those halos are believed to indicate where fluids, probably water, passed through the bedrock.
This latest finding comes two months after images from the Mars Global Surveyor showed changes in craters. That provides the strongest evidence so far that water moved through them.
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