How could the Universe be accelerating, despite the gravitational pull of all the matter in it?
A.) There's no friction in space.
B.) There could be less dark matter than we think.
C.) There could be a new force or property of space that affects the Universe on its largest scales.
D.) Our laws of nature are incorrect.
E.) Probably B and C.
Ans: C.) There could be a new force or property of space that affects the Universe on its largest scales
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The change in electrical potential energy per unit of charge that is moved from one place to another is known as ________
What will be an ideal response?
The menu shown in the figure is an example of a(n) ______ menu.
A. pop-out B. drop-down C. contextual D. off-canvas
This graph is made from measurements of the cosmic microwave background (dots) and a model based on the hypothesis of inflation. What does it show?
A) Measurements of the separation between regions of different temperature (in the cosmic microwave background) agree with predictions made by the hypothesis of inflation. B) It shows that the temperature of the cosmic microwave background is about 3 Kelvin. C) It shows that some regions of the early universe must have been hundreds of times as dense as others. D) It shows that the universe has no center and no edges.
Propene and cyclopropane are
a. the same compound. b. isomers. c. neither isomers nor the same compound.