No Abstract available for this article.doi:10.1038/313178a0Hughes, David WNature Publishing Group UKNature
B. Halley’s Comet is filled with dust.C. Halley’s Comet is a mixture of ice and dust.D. The structure of comet is equal to that of any other stars. 相关知识点: 试题来源: 解析 A [解析] 本题为推论题,考查考生理解并根据表述的细节或事实进行推论的能力。题目问:Fred Whipple博士称哈雷...
Halley’s Comet is believed to have originated from theKuiper Belt. Periodically, some of these blocks of rock and ice – which are essentiallyleftover matter from the formation of the Solar System some 4.6 billion years ago –are pulled deeper into the Solar System and becomes active comets....
It is predicted that Halley's Comet will next reach perihelion (closest point to the Sun) on 28 July 2061. The Earth will be in a better viewing position than it was in 1985-1986 since it will be on the same side of the Sun as the comet. The comet is expected to be about as br...
Comet Halley exhibited a red color characteristic of comet dust at these wavelengths with no clear variation with β . The JHK polarizations reach 25% at the largest phase angles with a reversal at β = 20° and negative polarizations of a few per cent at smaller β . The polarization ...
What does Dr. Fred Whipple mean when he says this? A.Halley"s Comet is a mass of ice covered with dust. B.Halley"s Comet is filled with dust. C.Halley"s Comet is a mixture of ice and dust. D.The structure of comet is equal to that of any other stars.查看答案...
What is the lecture mainly about?A.The instruments that study Halley's Comet.B.The internal structure of Halley's Comet.C.The future study of Halley's Comet.D.Some general knowledge about Halley's Comet.请帮忙给出正确答案和分析,谢谢!
Energetic ions upstream (7.5 × 106 km) of comet Halley—What are they and how did they get there?Energetic ions upstream (7.5 × 106 km) of comet Halley—What are they and how did they get there?The EPONA experiment on board the Giotto spacecraft measures high intensities of ions out ...
Sesamia calamistisChilo orichalcociliellusbiological controlindigenoushost plantsCyperaceaeGraminaeIn this paper an overview is given about the most interesting physical and chemical properties of the nucleus of Comet Halley learned from the VEGA space mission....
Schefter, Jim