Explain individual galaxies or clusters of galaxies do not expand in size despite the overall expansion of the universe implied by Hubble's Law
What will be an ideal response?
The pull of gravity works to slow the expansion rate of the universe. Therefore, in dense regions such as galaxies and clusters of galaxies, gravity is able to overcome the expansion and keep these objects from expanding. However, on larger scales, where the average density is lower, gravity does not have as strong an effect, and therefore the expansion continues between clusters of galaxies.
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Supernova remnants ________.
A. may contain up to 10 solar masses of material ejected from the star B. initially expand at thousands of km/s C. are important for mixing material into the interstellar medium D. All of these choices are correct.
You stand on a scale that rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity
A. N > mg
B. N = mg
C. N
The radiocarbon content of 14C decreases after the death of a living system with a half-life of 5730 y. If an archaeologist working a dig finds an ancient firepit containing some partially consumed firewood and the wood contains only 12.5 percent of the 14C content of an equal carbon sample from a present-day tree, what is the age of the ancient site?
The rock on the upper side of an inclined fault plane is called the hanging wall, and the rock on the underside is called the ______________
Fill in the blank(s) with correct word