时差N小时:地球同步卫星
日期:2014-11-04 15:55

(单词翻译:单击)

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A geostationary satellite orbitsthe planet at the same rate asthe planet rotates, so the satellite is always over the same patchof ground.
同步卫星以行星旋转的速度绕着行星运动,所以卫星总是处在地面同一块地方的上空8UWQ.R~cxgeH|O
Cool! you say. I'd like to have one of those about twenty feet over my house.
你会说,好酷!我宁愿有一个离我们房子只有二十英尺的卫星1^JU3(5p[c
Sadly, geos onlywork easily at one distance:
不幸地,同步卫星只能在同一个高度工作,
22,500 miles up.Why is that?
22,500 米的高空Rw!n!V!ETjmjZ~JTlW。为什么?
Other satellites can have different orbits, can't they?
其他卫星有不同的轨道,他们有吗?
Yes, they can. But that's because they can also move at different speeds.
是的,他们有#7U,#Hmn;3。那是因为他们能以不同的速度运动,

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A geo doesn't have thatoption-by definition it must orbit at the same speed as the earth turns.
而同步卫星没有那样的选择 他必须与地球自转同速运动r359(FdN2i
And that speeddetermines how high up it must be!
运动速度决定了他必须在的高度b(lz83QD~Y9qZK8v3FC
A satellite has to move at a certain speed to balance out gravity; otherwise it won't stay in orbit.
卫星必须以某一确定速度运动来平衡我们的重力;否则将不能保持在同一轨道上wS_aP_QNb8x
Now, a geo must move at the speed the earth turns.
现在,同步卫星必须以地球自转的速度同速运动v_z4~n1pAbYySA2~4LK.
If you put it in a very low altitude, that speed wouldn't be enough to balance gravity.
如果处于很低的高度,卫星的速度将不足以平衡重力W;S+pVggFUmvy5
Go higher, though, and gravity gets weaker.
高度越高,重力越小m4(#[2M.!#oUyv_XUs
At 22,500 miles, gravity will be just weak enough sothat a satellite moving at the speed of the earth's rotation will stay in orbit without help.
在22,500的高空,重力小到可以使卫星在没有帮助的情况下与地球同速运动,并且始终在同一轨道上-sjx0O8]P;ab23nyFS-
Of course, if you wanted to have a geo at a different altitude, you could always attach rockets toit and have them push continuously.
当然,如果你想有一个在不同高度的同步卫星,可以把卫星附在火箭,让火箭不断推动卫星前进Ws7*YWK&TDXu
But that's a pretty expensive option. At 22,500 miles,nothing else is required.
但是,这是相当昂贵的选择STaF7=,svKq,tr6GZk。在22500的高空,其他什么东西都不需要mJ2U3(Ine8mCK3s(M

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重点单词
  • altituden. 高度,海拔,高地
  • gravityn. 重力,严重,庄重,严肃
  • rotationn. 旋转,循环
  • optionn. 选择权,可选物,优先购买权 v. 给予选择
  • planetn. 行星
  • definitionn. 定义,阐释,清晰度
  • attachv. 附上,系上,贴上,使依恋
  • certainadj. 确定的,必然的,特定的 pron. 某几个,某