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發表於 2008-7-4 10:11:59
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原帖由 mca 於 2008/7/4 09:27 發表
教科書有沒有說錯,觀點與角度而已。
以“可見光” (有具體) 的範圍衡量,太陽系是圓形的,如果連傾斜角度大的彗星軌道也包括在內,你甚至可說太陽系像球體。
但是太陽系裡還有帶電荷的太陽風和行星自身的磁場,兩互相影響 ...
Agree with slight add-on.
I recall that I only learnt the solar system (from primary school textbook) that there is the Sun, the 9 planets (Yes! - 9), some planets coupled with moon(s), and they revolute around the sun in orbits laid on a plane (except Pluto and a Halley Comet) - and that's all of solar system.
I learnt about Oort's cloud, and much later, heliosphere in other astronomy leisure / layman books. When I just read the news title quickly , I thought it says "The Sun is not spherical", which draw my attention in the first place. Then I realized that the study is about the shape of solar system.
BTW, how do we define "solar system" ? I think it is some similar question like "how we define planet" ?
My 2 cents, |
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