How big is the Universe?
No one knows for sure how big the Universe is. There may be parts of the Universe beyond the reach of our telescopes. Also, astronomers are not sure that light comes from the most distant objects in the Universe in straight lines. The lines could be curved, making the objects look closer than they appear to be. However, they could be as much as 15,000 million light-years away.
comes…..in straight lines・・・一直線に飛んでくる
they appear to be・・・〜である様に見える
light-years・・・ここでは文字通り「光年」 口語では “light-years ago” で「ずっと昔に」つまり、long, long, time ago の事
