文章列表

• 1.Earth and Sky:Moon and Venus月球和金星
• Moon and Venus月球和金星 The planet Venus is now low in the west after sunset. It's not up for long after the sun goes down, but it's very, very brigh...
• 2.Earth and Sky:Plant Signals 植物的语言
• Plant Signals 植物的语言 Can plants smell and taste in the same way that animals do? Can they talk to each other and to insects? Learn how scientists ...
• 3.Earth and Sky:Galactic Rotation 银河系自转
• Galactic Rotation 银河系自转 Astronomers calculate there is ten times more matter in our Milky Way galaxy than we can actually see. Discover how the o...
• 4.Earth and Sky:Titicaca Reedbeds 的的喀喀湖的芦苇地
• Titicaca Reedbeds 的的喀喀湖的芦苇地 An ancient lake high in the mountains of South America holds lessons about indigenous peoples and sustainability....
• 5.Earth and Sky:Climate Puzzles 气候之迷
• Climate Puzzles 气候之迷 Scientists who predict Earth's future climate wish they knew how climate has changed in the past few thousand years. Learn mo...
• 6.Earth and Sky:Moon and Jupiter 月球和木星
• Moon and Jupiter 月球和木星 After traveling behind the sun for several months, the planet Jupiter is now visible again, just before sunup. Learn how t...
• 7.Earth and Sky:Sunscreened Plants 遮光植物
• Sunscreened Plants 遮光植物 A NASA researcher is finding that alfalfa plants grow more poorly when exposed to UVB -- ultraviolet B radiation from the ...
• 8.Earth and Sky:Global Warming and Ozone 全球变暖和臭氧
• Global Warming and Ozone 全球变暖和臭氧 Could the coming century bring a new threat to the ozone layer? Discover one scientist's model of the effect o...
• 9.Earth and Sky:Fire Cycle 火灾规律
• Fire Cycle 火灾规律 The El Nino phenomenon of 1997-98 unleashed torrential rain in some parts of the world, while creating abnormally dry conditions i...
• 10.Earth and Sky:Fire Regime 火
• Fire Regime 火 Fire was a creation of life -- born from oxygen and organic matter -- ignited by lightning. Thus fire has been a fundamental feature of...