s******o 发帖数: 298 | 1 At 24 and with no formal education in astronomy, Clyde William Tombaugh set
out to find "Planet X."
by S. Alan Stern
The faint, starry image jumped a little — very little, in fact. But the
heart of young Clyde Tombaugh, who saw the telltale twitch late one Tuesday
afternoon in February 1930, jumped a good bit more. Lowell Observatory, in
Flagstaff, Arizona, had hired Tombaugh just one year earlier.
The oldest of Muron and Adella Tombaugh’s six children, Clyde Tombaugh was
born in Streator, Illin |
|
s******o 发帖数: 298 | 2 At 24 and with no formal education in astronomy, Clyde William Tombaugh set
out to find "Planet X."
by S. Alan Stern
The faint, starry image jumped a little — very little, in fact. But the
heart of young Clyde Tombaugh, who saw the telltale twitch late one Tuesday
afternoon in February 1930, jumped a good bit more. Lowell Observatory, in
Flagstaff, Arizona, had hired Tombaugh just one year earlier.
The oldest of Muron and Adella Tombaugh’s six children, Clyde Tombaugh was
born in Streator, Illin |
|
w****l 发帖数: 344 | 3 冥王星 Pluto [小百科首页]
哈伯太空望远镜, 1996.3. (C) NASA / STScI
冥王星是从太阳数来第九颗、目前已知离太阳最远的行星,也是太阳系最小的行星,
甚至太阳系中有七颗卫星都还比它大(分别是月球、木卫一、木卫二、木卫三、木卫四、
土卫六及海卫一)!冥王星的平均轨道半径为591,352万公里 (39.5AU);直径为2,274公
里;质量是1.27x1022公斤。
由天王星及海王星的公转轨道异常,可预测出在海王星之外应该还有一颗行星的存在
,於是美国亚历桑那洲罗威尔天文台 (Lowell Observatory) 的 Clyde W. Tombaugh 在
经过非常绵密的研究和搜寻之後,终於在1930年找到了冥王星;但是这颗新行星的公转根
本和预测轨道不合,只在观测当时很接近预测的位置,再早一点或晚一点就不可能在预测
位置上找到它了,所以说冥王星的发现真是意料之外的幸运。
在冥王星被发现之後不久,大家就知道它实在是小得不足以解释其它行星轨道的异常
,因而接下来就是找寻所谓的「10号行星」(Planet X),可是始终一无所获;当航海家2
号量测出海王星真正的 |
|
s*****t 发帖数: 1994 | 4 【 以下文字转载自 Astronomy 讨论区 】
发信人: sunspot (小甜甜), 信区: Astronomy
标 题: New Mexico declares Pluto a planet
发信站: BBS 未名空间站 (Mon Mar 26 18:33:30 2007), 转信
Nearly 8 months after the International Astronomical Union
demoted Pluto from planet status, the state legislature of
New Mexico has declared that Pluto is a planet, naming
March 13 2007 "pluto Planet Day". The resolution notes that
Pluto has been called a planet for 75 years and that
Clyde Tombaugh, who discovered Pluto in 1930, was a resident
of New |
|
w****l 发帖数: 344 | 5 冥王星 Pluto [小百科首页]
哈伯太空望远镜, 1996.3. (C) NASA / STScI
冥王星是从太阳数来第九颗、目前已知离太阳最远的行星,也是太阳系最小的行星,
甚至太阳系中有七颗卫星都还比它大(分别是月球、木卫一、木卫二、木卫三、木卫四、
土卫六及海卫一)!冥王星的平均轨道半径为591,352万公里 (39.5AU);直径为2,274公
里;质量是1.27x1022公斤。
由天王星及海王星的公转轨道异常,可预测出在海王星之外应该还有一颗行星的存在
,於是美国亚历桑那洲罗威尔天文台 (Lowell Observatory) 的 Clyde W. Tombaugh 在
经过非常绵密的研究和搜寻之後,终於在1930年找到了冥王星;但是这颗新行星的公转根
本和预测轨道不合,只在观测当时很接近预测的位置,再早一点或晚一点就不可能在预测
位置上找到它了,所以说冥王星的发现真是意料之外的幸运。
在冥王星被发现之後不久,大家就知道它实在是小得不足以解释其它行星轨道的异常
,因而接下来就是找寻所谓的「10号行星」(Planet X),可是始终一无所获;当航海家2
号量测出海王星真正的 |
|