What produces the afterglow of a gamma-ray burst?
a) Collisions between planets and stars.
b) Repeated explosions of the central star.
c) Gradual escape of particles from a central black hole.
d) X-rays travel more slowly through space than other types of radiation so they producean afterglow.
e) Collision of expanding stellar material with gas and dust in the interstellar medium.
Ans: e) Collision of expanding stellar material with gas and dust in the interstellar medium.
You might also like to view...
Two stars have the same spectral type. Star X is in luminosity class III, while Star Y is in luminosity class V. Therefore, Star X is larger in radius than Star Y
Indicate whether the statement is true or false
Wire, briar, limber, lock, three geese in a flock. One flew east, one flew west, and one flew over the cuckoo's nest. If they all flew at the same speed and the cuckoo's nest is to the northwest, which graph represents their total momentum?
A. 
B. 
C. 
The force due to gravity between two objects depends on I. the mass of each object. II. the distance each object is from Earth. III. the distance between the two objects. IV. the speed of light
a. I & II b. I & III c. II & IV d. I, II, & III e. I, II, III, & IV
Which of the following claims can be tested by scientific means?
a. the final thought of Abraham Lincoln were about the fate of his country b. God exists c. blue is the best color for walls d. people born when the sun is in constellation of Leo are more financially successful than other people