Homework Handout 7 - HW7 Due Thursday April 3 If words are required in an answer then the answer should be expressed in a complete sentence If a number

Homework Handout 7 - HW7 Due Thursday April 3 If words are...

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HW7: Due Thursday April 3 If words are required in an answer, then the answer should be expressed in a complete sentence. If a number is required in an answer, then the number should have the correct number of significant figures, and should include units. If you are asked a multiple choice question, you are required to indicate all correct answers (and there may be more than one). Remember to show all work, and be legible and clear. Your homework should be returned on a separate piece of paper. 1. What do astronomers mean when they say that we are all “star stuff”? A) that life would be impossible without energy from the Sun B) that Earth formed at the same time as the Sun C) that the carbon, oxygen, and many elements essential to life were created by nucleosyn- thesis in stellar cores D) that the Sun formed from the interstellar medium: the ”stuff” between the stars E) that the Universe contains billions of stars 2. What do we mean by the singularity of a black hole? A) There are no binary black holes each one is isolated. B) An object can become a black hole only once, and a black hole cannot evolve into anything else. C) It is the center of the black hole, a place of infinite density where the known laws of physics cannot describe the conditions. D) It is the edge of the black hole, where one could leave the observable universe.
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