When we see a star in the night sky, we are actually seeing how it was sometime in the past. This is because light takes time to
travel from the star to Earth. Light travels 9.5 × 1015 m in one year. This distance is called 1 light year. When an astronomer sees the star Betelgeuse, which is approximately 6.08 × 1018 m from Earth, how long ago did the star appear the way it does to her today?
9.5 x 1015 = 9642.5 <span>6.08 × 1018 = 6189.44 If you take these two problems, and then subtract, and find out the difference between the two distances, then you should be able to get your answer.
True or false: Typically, once a protein is synthesized in a healthy cell, it will perform its function indefinitely because the cell environment is highly controlled.
