What evidence suggests that some small galaxies in our Local Group have undergone two or more starbursts in the past?
A) We observe several small galaxies currently undergoing massive star formation.
B) We see small galaxies in which many stars have one age and many others have another age that is billions of years older.
C) We see evidence that small galaxies in our Local Group have experienced several collisions in the past.
D) We see evidence that several small galaxies were shot out of larger galaxies in our Local Group during a period of starburst activity.
B) We see small galaxies in which many stars have one age and many others have another age that is billions of years older.
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In a vacuum, the relative permeability is
A) zero. B) 4? × 10-7 T/A-m. C) 1.0. D) infinite. E) 8.99 × 109.
The Big Bang
A) took place within space. B) marked the beginning of space and time. C) occurred as a result of disturbances within the Large Magellenic cloud. D) took place within time.
Suppose 25 g of reactant A is mixed with 45 g of reactant B. After a chemical reaction takes place between A and B, which statement is correct?
a. The total mass of products plus any unreacted reactants will be 70 g. b. The total mass of products plus any unreacted reactants will be less than 70 g. c. The total mass of products plus any unreacted reactants will be more than 70 g. d. The total mass of products will be 70 g.
_________is the degradation of a material because of electrochemical reactions with its environment.
Fill in the blank(s) with the appropriate word(s).