physical science

Step 2- Respond to the following:

  • What does a Light Year measure? Is it a unit of time? Explain.
  • According to your reading, how old is our Universe? 
  • Based on the two points above, what is the greatest distance light could have traveled since the universe formed?
  • Why does the “Known Universe” tour STOP at a certain point? Why is this the farthest we can see?


  • Discuss the main physical processes that occur in each layer of the sun.
  • What makes the sun so hot? Describe the fusion process that allows it to produce all the energy we require to survive.
  • Fusion is very hard to produce. What about the sun allows fusion to happen there?


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