外研版英语八年级下册《We have not found life on any other planets yet》journey to space PPT课件下载
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外研版八年级英语下册《We have not found life on any other planets yet》journey to space PPT课件下载，共20页。
In the universe, there are many galaxies.
galaxy ['��æləksɪ]星系
the Galaxy 银河系
the Milky Way
planet 行星
A planet can’t shine.
star 恒星
A star can shine.
Read Para 3 and answer
1. What have scientists discovered?
They’ve discovered many other galaxies in the universe.
2. Why is it impossible to imagine how large the universe is?
Because they are very far away and their light has to travel for many years to reach us.
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