Old stars are poor in heavy atoms because there were very few previous generations of stars before the old stars formed
Indicate whether the statement is true or false
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Which of the following stars will live longest?
A) a 1-solar-mass star B) a 2-solar-mass star C) a 3-solar-mass star D) a 4-solar-mass star E) a 5-solar-mass star
Sodium metal is
A) oxidized in the production of aluminum. B) reduced in the production of aluminum. C) both oxidized and reduced in the production of aluminum. D) neither oxidized nor reduced in the production of aluminum.
In ___________, the material is forced through an opening in a die into the desired shape.
Fill in the blank(s) with the appropriate word(s).
What do we mean by the event horizon of a black hole?
A) It is the boundary within which events in the black hole cannot influence events in the outside universe. B) It is the center of the black hole. C) It is the "bottomless pit" of the black hole. D) It is the place where time begins to slow down as you approach a black hole.