Which of the following is a good model for how the universe has changed over time. *
1 point
What TWO factors cause clouds of gas and dust to become a star? *
2 points
Required
The older the sun the heavier the elements it produces. *
1 point
Which of the following must be true in order for the forces within the sun, to remain stable. *
1 point
What shape, from geometry, do scientist use to calculate the distance between stars? *
1 point
What color do stars appear if they are coming toward the earth? what about when they are going away. What Use the following diagram to help you answer this question. (Choose TWO) *
2 points
Required
Hertzsprung and Russel classified stars by . . . (choose ALL that apply) *
3 points
Required
What force causes Black Holes to appear black? *
1 point
Constellation can be thought of as 2 dimensional pictures created by stars in the sky. *
1 point
Distance in space in measured in . . . *
1 point
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