Idioms
hear of (someone or something)
to know about someone or something, to be familiar with someone or something
I have never heard of the singer.
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Fact
Every 14 years, Saturn's rings become briefly invisible to astronomers on Earth. At that time, the plane of the rings is tipped to that of the Earth's orbit, and they are seen edge-on. Since the ring's are so thin, they can't be seen at that angle. .. More >>
Every 14 years, Saturn's rings become briefly invisible to astronomers on Earth. At that time, the plane of the rings is tipped to that of the Earth's orbit, and they are seen edge-on. Since the ring's are so thin, they can't be seen at that angle. .. More >>
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