Z**R
发帖数: 1233 | 1 【 以下文字转载自 Military2 讨论区 】
发信人: ZZGR (闲逛), 信区: Military2
标 题: 嫦娥和兔兔被偷窥了
发信站: BBS 未名空间站 (Mon Dec 30 18:59:54 2013, 美东)
http://lroc.sese.asu.edu/news/index.php?/archives/849-Change-3-
Chang'e 3 landed on Mare Imbrium (Sea of Rains) just east of a 450 m
diameter impact crater on 14 December 2013. Soon after landing, a small
rover named Yutu (or Jade Rabbit in English) was deployed and took its first
tentative drive onto the airless regolith. At the time of the landing LRO's
orbit was far from the landing site so images of the landing were not
possible. Ten days later on 24 December, LRO approached the landing site,
and LROC was able to acquire a series of six LROC Narrow Angle Camera (NAC)
image pairs during the next 36 hours (19 orbits). The highest resolution
image was possible when LRO was nearly overhead on 25 December 03:52:49 UT (
24 December 22:52:49 EST). At this time LRO was at an altitude of ~150 km
above the site, and the pixel size was 150 cm.
The rover is only about 150 cm wide, yet it shows up in the NAC images for
two reasons: the solar panels are very effective at reflecting light so the
rover shows up as two bright pixels, and the Sun is setting thus the rover
casts a distinct shadow (as does the lander). Since the rover is close to
the size of a pixel, how can we be sure we are seeing the rover and not a
comparably sized boulder? Fortuitously, the NAC acquired a "before" image (
M1127248516R) of the landing site, with nearly identical lighting, on 30
June 2013. By comparing the before and after landing site images, the LROC
team confirmed the position of the lander and rover, and derived accurate
map coordinates for the lander (44.1214°N, 340.4884°E, -2640 meters
elevation).
The lander set down about 60 meters east of the rim of a 450 meter diameter
impact crater (40 meters deep) on a thick deposit of volcanic materials. A
large scale wrinkle ridge (~100 km long, 10 km wide) cuts across the area
and was formed as tectonic stress caused the volcanic layers to buckle and
break along faults. Wrinkle ridges are common on the Moon, Mercury and Mars.
Lunar mare basalts are divided into two main spectral (color) types: "red"
and "blue" (blue is perhaps a misnomer, think "less red"). Basalts on the
Moon (same on Earth) are composed mainly of two minerals, pyroxene and
plagioclase, though olivine and ilmenite can sometimes occur in significant
amounts. The presence of ilmenite (FeTiO3) results in lower reflectance and
a "less-red" color - thus the blue basalts. The landing site is on a blue
mare (higher titanium) thought to be about 3.0 billion years old. The
boundary (black arrows in above WAC mosaic) with an older (3.5 billion years
) red mare is only 10 km to the north. | k*******g
发帖数: 7321 | | v*******e
发帖数: 11604 | 3
无话可说？你太小看他们了，这显然是美国为中国cover up，因为中国为美国cover up
登月造假，美国这么做是报恩。
【在 k*******g 的大作中提到】
: 那些说TG也做假的人，无话可说了吧！
| t******r
发帖数: 152 | 4 主子扇奴才脸了，奴才还敢说话吗？
【在 k*******g 的大作中提到】
: 那些说TG也做假的人，无话可说了吧！
| c*******n
发帖数: 2764 | 5 这话说出来你自己信吗？
up
【在 v*******e 的大作中提到】
:
: 无话可说？你太小看他们了，这显然是美国为中国cover up，因为中国为美国cover up
: 登月造假，美国这么做是报恩。
| v*******e
发帖数: 11604 | 6 我显然是反对登月造假说的，你这个看不出来也不用混了。
【在 c*******n 的大作中提到】
: 这话说出来你自己信吗？
:
: up
| g***t
发帖数: 7544 | 7 被质疑的是阿波罗十一号登月，不是所有的登月。
【在 v*******e 的大作中提到】
: 我显然是反对登月造假说的，你这个看不出来也不用混了。
| C****a
发帖数: 6593 | 8 张国焘你想象力太丰富了
这两天怎么没看见你啊
出去玩去了？
up
【在 v*******e 的大作中提到】
: 我显然是反对登月造假说的，你这个看不出来也不用混了。
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