The New book of popular science 2 pdf epub mobi txt 电子书 下载 2024
发表于2024-11-10
The New book of popular science 2 epub 下载 mobi 下载 pdf 下载 txt 电子书 下载 2024
The New book of popular science 2 epub 下载 mobi 下载 pdf 下载 txt 电子书 下载 2024
The New book of popular science 2 pdf epub mobi txt 电子书 下载 2024
图书描述
To people before the seventeenth cen-
tury, the earth was the center of all things -
the hub around which revolved the sun,
moon, stars, and planets. This geocentric,
or "earth centered," theory has since been
abandoned. We know now that the earth is
a small planet and that it and its sister plan-
ets orbit a star called the sun. We know,
too, that the sun is one of thousands of mil-
lions~ of stars in the "island universe"
known as the Milky Way galaxy. This gal-
axy, in turn, is only one of thousands of mil-
lions of "island universes." Obviously,
then, our planet is only an insignificant
speck in the universe and not its center.
Yet, tiny though it is, the earth is of su-
preme importance to us humans, for it is
our home in space.
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