标题: 【国家地理杂志片段】Sky Show This Weekend: Venus to Meet Elusive Mercury [打印本页] 作者: yush 时间: 2010-4-2 14:40 标题: 【国家地理杂志片段】Sky Show This Weekend: Venus to Meet Elusive Mercury N5 Q8 Z* Z A; {9 s5 ?5 @. `' ~$ D
A sky-watcher gazes at Mercury (lower left) and Venus in the evening sky over Germany in October 2009.# p+ f' g$ N- K6 }. h
& u/ V3 ^- W5 x% n' W( A% ]Andrew Fazekas# z4 R! F# X" F" n" B2 ?
for National Geographic News / s0 y: l. ?& P7 V0 m% hPublished April 1, 2010 - ?+ c1 t1 ]; `7 I0 H9 X4 ]Normally elusive, Mercury will be a "star" for most of April, shining brightly near Venus above the evening skyline. : x- E$ v5 S1 w4 |3 x% q$ bBoth planets will be visible to the naked eye for the next two weeks as bright, starlike objects that will dominate the low western sky shortly after sunset. * {) m: \6 q' Z. ^" W- q1 D/ S, p"From a place with a low horizon, one should be able to get a nice view of these two planets hanging in the darkening sky like gems," said Geza Gyuk, staff astronomer at the Adler Planetarium in Chicago. - f- Q* R! q* xAs the cosmic duo climb higher, the'll reach conjunction—their closest approach to each other—on Saturday and Sunday.% U3 ?. p( W. n$ i/ \# ~0 }' c
Those nights the two planets will seem to be separated by only three degrees, or the equivalent of six full-moon disks. 8 C; ^; ~8 A3 `/ f1 ^Venus Guides Eyes to Mercury - s3 ?6 w7 h" F0 A" h9 q) ?Of the five planets visible to the naked eye, Mercury is usually the most challenging to see, because it never wanders far from the sun.$ A2 j& W1 \1 P6 b1 [ O6 E
The innermost planet, Mercury orbits the sun so closely that a year lasts just 88 Earth days. (See pictures of Mercury taken by a passing spacecraft.)+ k2 G2 v: i1 A2 V' z$ c
As seen from Earth, Mercury tightly hugs the horizon, and it appears faint because it's swathed in the sun's glare. 1 x4 c1 I _0 c( P$ d. g7 p"Most people never get to see Mercury, because it ... isn't very bright. But this conjunction is coming around Mercury's maximum elongation [the planet's farthest angle away from the sun] of 20 degrees on April 8," Gyuk said. : S' E: p; q j eBrilliant Venus will serve as a guidepost for sky-watchers to easily find tiny Mercury. (Related: "Neptune Easier to Spot Now, Thanks to Jupiter.")! m& e# i6 Y$ _8 x8 x0 y
"Weather permitting," Gyuk said, "I'm certainly going to be out with my kids looking for Mercury!"% g% U5 E1 `& `! h+ a) p" j Full Planetary Collection + O6 l5 c% v/ K& o) ?9 n' jAs an added bonus, planet-hunters already out to spy Venus and Mercury will be able to see all five naked-eye planets in a single night.! v5 j+ q, l; @ H9 a
As darkness sets in, Mars will become visible directly overhead, appearing as a red-tinged, starlike object. A little later, Saturn will appear slightly above the eastern horizon and will rise higher during the night./ b+ k1 L7 P C! P
(Related: "Sky-watcher Beware: Mars Email a 'Spectacular' Hoax.") ) v& y. z* w, E+ GFinally, the gas-giant planet Jupiter will rise in the east just before sunrise作者: voko 时间: 2010-4-2 15:12
这也是悬赏翻?作者: yush 时间: 2010-4-2 15:24 标题: 我们带头来做个谋杀艺术3的专题吧 [s:70] 是悬赏 带斜体的都是7 _( W O( i, d0 t0 Y
