共查询到20条相似文献，搜索用时 15 毫秒
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Michael E. Lipschutz Brodie Spaulding Brian D. Kinzie Solomon Gartenhaus 《Meteoritics & planetary science》1993,28(2):240-242
Abstract We describe the circumstances of fall of a 0.5-kg meteorite that landed in Noblesville, Indiana, USA, 3.6 m in front of two witnesses on 1991 August 31. Provisional assessment of Noblesville as an H chondrite is confirmed by data reported elsewhere which demonstrate that it is a regolith breccia with unusual properties. 相似文献
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L. D. Barr 《Astrophysics and Space Science》1989,160(1-2):71-85
The National Optical Astronomy Observatories (NOAO) are planning to buld two 8 m telescopes, one for Mauna Kea, Hawaii, the other for a site in Chile. Optical configurations, primary mirror systems, and the telescope mounting are discussed. A new optical testing method is outlined. The system imaging goal is 0.25 FWHM. Construction could begin in the early 1990's.Paper presented at the Symposium on the JNLT and Related Engineering Developments, Tokyo, November 29–December 2, 1988.Operated by the Association of Universities for Research in Astronomy Inc., under contract with the National Science Foundation. 相似文献
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Earth, Moon, and Planets - 相似文献
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