a guide to the sky
glowing in the sky , we ’ re seeing what she looked like a little over a second ago . Sunlight takes an average of approximately 8 minutes to reach Earth . The closest star to the solar system is Proxima Centauri whose light takes 4.22 years to reach Earth . We say it is 4.22 light years from
Earth . The light year unit refers to the distance light travels in one year and is equivalent to approximately 9.46 trillion kilometers . The Andromeda Galaxy , for example , is located approximately 2.9 million light years away ! We now look at what it was like 2.9 million years ago ! There are stars
located billions of light years away from us . When we look at the starry sky , we are taking a journey into the past . The Universe we see is a movie screen covered with old images . How to imagine your setup today ? Which of these stars still exist ?
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