“To provide enough power, we need certain methods with high energy density(密度)”,said Jae Kwon, assistant professor of electrical and computer engineering at MU. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. Ī.lava and energy B.water and radiation from spaceĬ.gases and lava D.water and protection from radiationīatteries can power anything from small sensors to large systems. Ī.such caves could provide energy for lifeī.they had finally found the caves on MarsĬ.such caves would be perfect places to hunt for lifeĭ.scientists had long been looking for these cavesĦ7.Necessary conditions for life on Mars mentioned in the passage may include. the scientists found all the caves at nightĬ.it is certain that there is life in these cavesĭ.the surface of Mars is bitterly cold, radiation-soaked and dryĦ6.According to the passage, Dr. Scientists have completely recognized the surface of Mars.ī. Caves on Mars may be full of hot air or a sign of life.ĭ. How scientists found these caves on Mars.Ĭ. The outside of the tubes cooled, forming solid walls, while something hotter inside allowed the remaining have to flow out, forming caves.Ħ4.What does the passage mainly talk about?ī. The caves probably formed when tube-shaped lave flows(管状岩浆流) spread across the planet long ago. A cave is also a protection from radiation the surface of Mars is exposed to high levels of space radiation.” “If there are gases coming out, they could provide energy for a whole range of bacteria. “Tiny drops of water could collect inside,” he said. He agreed such caves would be perfect places to hunt for life escaping from the bitterly cold, radiation-soaked(充满辐射的), dry surface. “People have been looking for these for a long time now we have found them.” One photo taken at night by an infrared imager(红外线成像器) showed one hole to be unusually warm, suggesting hot air trapped during the day is flowing out. Jonathan Clarke, a geologist with the Mars Society of Australia, yesterday described the discovery as exciting. “If there is life on Mars, there is a good chance you’d find it in caves,” said Jut Wynne,one of the researchers who noticed the features while working on a US Geological Survey Mars Cave Detection Program. Each as large as a football field, they may be openings into natural caves below the Martian surface. The first caves discovered beyond the Earth appear as seven mysterious black dots on the pictures sent back by NASA’s Mars Odyssey orbiter. The picture of the day has appeared daily since June 1995.Scientists have found what look like caves on Mars(火星), and say they could be protecting life from the planet’s terrible environment. The Astronomy Picture of the Day is a service of the Astrophysics Science Division at the space agency's Goddard Space Flight Center in Greenbelt, Md., and Michigan Technological University in H0ughton, Mich. The image of the full-circle rainbow, with a fainter image outside it, followed the helicopter intact for about five kilometers (about three miles), NASA said. From the air, though, the entire 360 degree circle of a rainbow is more commonly visible." "From the ground, typically, only the top portion of a rainbow is visible because directions toward the ground have fewer raindrops. 30 on NASA's Astronomy Picture of the Day, with this explanation: Given all that, it was a great catch last year when Australian photographer Colin Leonhardt, of Bird's Eye View Photography, snapped a photo of a double full-circle rainbow from a helicopter over Cottesloe Beach near Perth.Īccording to NASA, the helicopter was flying between a setting sun and a downpour. But it would take just the right conditions of sunlight and rain drops.
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