One of the factors that misled the herschels into concluding that we are at the universe's center was:
a. hot hydrogen gas in our galaxy's disk, its emission hiding the more distant stars
b. dust that obscures the more distant stars and thereby localizes observations
c. gravitational lensing of light by dark matter, distorting the positions of the stars
d. some "neutron star clusters" that are actually distant galaxies that are distributed uniformly around the sun

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explanation:

the correct answer is d

i think option 3. would be ur best bet and u need to write it urself

have a good day

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

hope this .

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