When we observe a star, is the information we receive from it for the past or the future? Why?
Light is measured in light years, which is the distance light travels in one year. The information we receive to see a star of the past, because he left, traveled some "light years" to get us to see her walking the great distances of space.
For example, a ray of light from the Sun would take 30 000 years to reach the center of our galaxy
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