We can compare it with thunder. Thunder can always be heard after we have seen lightning. This is because sound waves travel more slowly than light waves. When we hear a burst of thunder we are hearing the sound of something that happened a moment earlier. Merry husky christmas unisex hawaiian shirt. The story of the stars is similar. When we look at a star thousands of light-years away, we are looking at a ‘thunderbolt’ of an event that happened at that star thousands of years ago. But so far my father and son have only talked about our galaxy. Astronomers say there are about a hundred billion galaxies in the universe, and each of them has about one in a billion stars.
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