Spacecraft orbiting Mars have shown what appear to be rivers, lakebeds and mineral deposits. These images suggest that, at one time, water did flow there. Mars Rover vehicles and other spacecraft have confirmed the information.
BOB DOUGHTY: Caltech Geology Professor John Eiler was another writer of the report. He says knowing the temperature of Mars from long ago provides valuable information. It shows that early in the planet’s history, at least part of Mars could support a climate like that of Earth.
The meteorite the scientists examined is one of the oldest known rocks in the world. It is called the Allan Hills meteorite. Its name came from the place in Antarctica where it was found in nineteen eighty-four. The meteorite is believed to have blown loose from the Mars’ surface when another space rock struck its “home.”
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BARBARA KLEIN: Earlier this year, we reported on sharks. Wildlife activists worry that some kinds of sharks are in danger of disappearing. We also told how demand for shark fin soup has led to the killing of millions of sharks. The animals are harvested for meat, liver oil and, especially, for their fins.
Sharks swimming in the Pacific Ocean about five kilometers from the coast of Hawaii
Last month, the governor of California, Jerry Brown, signed a bill that bans the sale or possession of shark fins in the state. The California Senate approved the bill in September, by a vote of twenty-five to nine.
最新
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25