Distance in spaces are measured in light years

Distance in spaces are measured in light years

We live on a planet called earth.To us it is enormous.It is our home space.But the earth is only a tiny part of the univers.If you look up at the sky on a clear night,you can see thosuands of stars.The patterns of stars are called the constellations.The sun is a star.It looks very different from the stars you see at night because it is close to us.The sun is about 150000000 km away.The next nearest star to the earth is called Proxima Centauri.It is 40000000000000 km from the earth.

These distance are very large by earth standards.The kilometer or meter is not a very useful measurement for astronomers to use.Instead,they can use light years.Light travel through space at 300000000 meter per second.In one year,it travels 9500000000000 km.So one light year is 9500000000000 km.Proxima Centauri is 4.2 light years from the earth.If you look at Proxima Centauri(which you would need to do with a telescope,because it is very faint star),you see it as it was 4.2 years ago.


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