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Congress made an agreeable discovery three years ago. Early in 1994, in an abrupt statistical spike, voters in large numbers started saying that crime was their No. 1 concern. So when the House and Senate passed the omnibus crime bill later that year, people actually noticed. Which is one reason...
Indeed, after only a week on the surface of Mars, Pathfinder had conducted dozens of worthy science experiments, had begun to challenge at least one long-held perception about the red planet and had transmitted more than 1,700 photos of the landscape, many of which were incorporated into a...
After bombarding the reddish dirt with helium nuclei and analyzing the resulting patterns of radiation, the spectrometer revealed that the soil was rich in iron and virtually identical to that examined at other sites 21 years earlier by the Viking landers. This suggested to scientists that Martian topsoil is widely...
What surprised many scientists was that the data appeared to liken Barnacle Bill to andesites, which are volcanic rocks usually found on Earth in the Andes Mountains and other areas of explosive volcanism. Andesites are typically formed by the repeated melting, solidifying and remelting that occurs during the tectonic-plate...
"How that happens in the absence of plate tectonics is not well understood," admits Robert Strom, a University of Arizona planetary scientist. To NASA Goddard scientist Jim Garvin, the finding suggests that a geology significantly more complex than scientists had expected was at work on Mars. "It's not the...