·[新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]Black and White黑与白Sometimes you hear it said that white is a combination of all the colors of the rainbow -- and that black is the absence of color. Find out more about whether black and white are colors -- today on Earth and Sky. JB: This is Earth and Sky. A listener wants to know, "Are black and white really colors?"DB: Color isnt a physi……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]Sierra Treeline 山脊树林Could global warming allow forests to expand into higher elevations than they have reached in more than a thousand years? Learn more about studying alpine treelines -- today on Earth and Sky.JB: This is Earth and Sky. The highest point that trees grow on a mountain -- called the treeline -- is based in part on temperature.DB: Andy Bunn is a ……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]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 the Earth for at least 400 million years. A scientist talks about fire -- today on Earth and Sky.JB: This is Earth and Sky, speaking with fire expert Steve Pyne, in the Biology and Society program at Arizona State ……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]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 in others. And it sparked record numbers of wildfires. Learn more about climate and wildfire -- today on Earth and Sky.JB: This is Earth and Sky. We spoke with fire expert Steve Pyne of Arizona State University in Tempe……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]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 scientists model of the effect of global warming and greenhouse gases on ozone -- on todays Earth and Sky. DB: This is Earth and Sky.JB: After 30 years of steady decline, Earths ozone layer is thinner but seems to be stab……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]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 sun. Learn more about sunscreened plants -- today on Earth and Sky.JB: This is Earth and Sky. Earths ozone layer protects us from the suns ultraviolet -- or UV, radiation. Ozone depletion has been blamed for an increas……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]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 to see Jupiter near the waning moon on Wednesday morning -- on todays Earth and Sky. JB: This is Earth and Sky. The highest point that trees grow on a mountain -- called the treeline -- is based in part on temperature.DB……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]Climate Puzzles 气候之迷Scientists who predict Earths future climate wish they knew how climate has changed in the past few thousand years. Learn more about modeling global climate -- today on Earth and Sky.JB: This is Earth and Sky. Most scientists agree that humans are having an impact on Earths climate. But theyre also still discovering natural ways that global ……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]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. Discover Lake Titicaca -- today on Earth and Sky. DB: This is Earth and Sky. Lake Titicaca is high in the Andes Mountains of South America. At three million years of age, its a……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]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 orbital motions of stars in the galaxy reveal dark matter -- on todays Earth and Sky.JB: Im Joel Block.DB: And Im Deborah Byrd for Earth and Sky. A listener writes, I was wondering if the sun (and its solar system) revol……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]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 hope to unravel some of the mysteries of plant senses -- on todays Earth and Sky.JB: This is Earth and Sky. If an insect is damaging a plant, the plant may send out an airborne signal -- like an odor -- attracting just ……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]Moon and Venus月球和金星The planet Venus is now low in the west after sunset. Its not up for long after the sun goes down, but its very, very bright. Learn how to see Venus tonight near Earths companion moon -- today on Earth and Sky.JB: This is Earth and Sky. Earths ozone layer protects us from the suns ultraviolet -- or UV, radiation. Ozone depletion has been blam……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]Amazon GIS 亚马逊地理信息系统In the Amazon, theres a growing human population in a region that also contains 30% of Earths total plants and animals. Learn how scientists have put together an Internet window to the Amazon -- today on Earth and Sky. JB: This is Earth and Sky, continuing to speak with Thomas Lovejoy, president of the Heinz Center for Sci……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]Forests and CO2 森林和二氧化碳The amount of fossil fuel emissions released into the atmosphere has steadily risen since the Industrial Revolution. But recently, part of those emissions have been disappearing. Learn more about forests and CO2 -- on todays Earth and Sky.DB: This is Earth and Sky. When we burn fossil fuels, we send carbon dioxide -- or CO2 -- into the ai……
·[ 新窗口浏览 MediaPlayer 文件 或是右键“目标另存为”下载]Aqua Technology 水资源监测科技A new weather-monitoring satellite has been 30 years in the making, and some researchers think its worth the wait. Well speak with a scientist about the Aqua satellite -- on todays Earth and Sky.DB: This is Earth and Sky. In May of 2002, NASA launched a state-of-the-art weather satellite called Aqua. It measures temperature and moisture i……
