搜索结果: 136-150 共查到“国际动态 行星物理学”相关记录190条 . 查询时间(1.996 秒)
英科学家发现迄今距离地球最近褐矮星（图）
英国 科学家 褐矮星
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2010/4/12
据英国《新科学家》杂志报道，日前，科学家最新观测到一颗距离地球仅有9.6光年的昏暗星体，它可能是迄今距离地球最近的褐矮星。同时，这颗恒星比其他邻近星体更加“寒冷”，看上去就如同一颗“黑色太阳”。
这项发现暗示着褐矮星存在非常普遍，并且它们与地球的距离更接近。褐矮星的质量非常小，因此它们无法达到一定的热量并承受类似太阳的核聚变反应。但它们仍然可以发光，在形成过程中会产生热量发光，然后逐渐冷却，光线...
科学家发现金星上可能仍有火山活动的新证据（图）
科学家 金星 火山活动 证据
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2010/4/12
欧洲和美国科学家日前从欧洲航天局“金星快车”探测器传回的金星地质图像中发现了一些年代较新的熔岩流痕迹，这为金星上仍有火山活动的观点提供了新证据。
欧航局日前发表公告说，上述发现表明，金星很可能是除地球外太阳系另一颗地质仍然活跃的行星。科学家说，了解这一常被称为地球“孪生姐妹”的行星邻居会帮助人们了解地球自身的演变史。
公告援引参与这项研究的美国航天局喷气推进实验室科学家斯姆雷卡尔的话说，科学家...
天文学家证明海卫一也有“夏天”（图）
天文学家 证明 海卫一
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2010/4/12
如果你现在正站在海卫一（如上图）的南半球，那么你将经历这颗星球夏季的最高温度，不过请忘了防晒霜和沙滩椅吧。
据美国《科学》杂志在线新闻报道，天文学家已经证明，在这颗海王星的最大卫星上，夏季的温度不会超过零下230摄氏度。然而即便相距45亿公里，太阳依然能够在海王星的系统中产生季节的变化。以海卫一为例，夏季的太阳能够将卫星表面冰冻的一氧化碳升华为气体。而这片区域在另一个70年中则将是冬季，到时候南...
Explained: Dynamo theory--Recent discoveries raise questions about how small planets can have self-sustaining magnetic fields（图）
Dynamo theory small planets self-sustaining magnetic fields
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2010/4/21
The Earth’s global magnetic field is generated in its metallic core, located nearly 3,000 kilometers beneath the planet’s surface. The field has existed on Earth for at least 3.5 billion years and off...
When people talk about global warming or the greenhouse effect, the main underlying scientific concept that describes the process is radiative forcing. And despite all the recent controversy over leak...
Images of extrasolar planets win award for most outstanding papers in Science（图）
extrasolar planets Science
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2010/3/4
A picture is worth a thousand words, or so University of California, Berkeley, astronomer Paul Kalas found out when he published a Hubble Space Telescope image of a Jupiter-sized planet orbiting the s...
Researchers in the US have used a ground-based telescope to detect organic compounds in the atmosphere of an exoplanet – that is, a planet orbiting a star other than our Sun. The result, the researche...
Planetary physics shrunk into a lab as MIT pursues fusion（图）
Planetary physics a lab MIT pursues fusion
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2010/1/29
Researchers in the US have simulated a magnetic field structure normally produced by the core of a planet, and they say that their design could lead to an efficient way of harnessing nuclear fusion fo...
Astronomers have worried about the impact that asteroids could have on Earth ever since a theory was proposed in the 1980s that a giant asteroid likely caused the extinction of the dinosaurs 65 millio...
Public Invited to Pick Pixels on Mars – Scientists Taking Suggestions on Where to Image the Red Planet Using NASA Satellite
Public Pixels Mars the Red Planet NASA Satellite
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2010/1/26
The most powerful camera aboard a NASA spacecraft orbiting Mars will soon be taking photo suggestions from the public.
Since arriving at Mars in 2006, the High Resolution Imaging Science Experiment,...
Astronomers in Canada and Germany have made the first direct measurement of the atmospheric spectrum of a planet outside our solar system. Using the European Southern Observatory (ESO) Very Large Tele...
Scientists working on NASA's Kepler mission have unveiled the first five exoplanets discovered by the space telescope since it was launched in March 2009. The exoplanets – planets orbiting stars other...
NASA's Kepler Space Telescope Discovers Five Exoplanets
NASA's Kepler Space Telescope Five Exoplanets
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2010/1/11
NASA's Kepler space telescope, designed to find Earth-size planets in the habitable zone of sun-like stars, has discovered its first five new exoplanets, or planets beyond our solar system.Kepler's hi...
NASA Partners with Saudi Arabia on Moon and Asteroid Research
NASA Partners Saudi Arabia Moon and Asteroid Research
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2009/12/18
NASA and the Kingdom of Saudi Arabia's King Abdulaziz City for Science and Technology (KACST) have signed a joint statement that allows for collaboration in lunar and asteroid science research. The pa...
Planet 51 Star Brings NASA's Message of Exploration Down to Earth
Planet 51 Star NASA's Message Exploration Earth
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2009/11/24
Actor Dwayne Johnson, usually known for his action and comedic film roles, takes to the stars as an astronaut in a new animated feature that brings important messages about the importance of space exp...