The cosmological principle states that any observer in any galaxy will see the same general features of the Universe
a. True
b. False
Indicate whether the statement is true or false
True
You might also like to view...
Two billiard balls have velocities of 2.0 m/s and -1.0 m/s when they meet in an elastic head-on collision. What is the final velocity of the second ball after collision?
a. +2.0 m/s c. -0.5 m/s b. -1.0 m/s d. +1.0 m/s
How do we know that the Universe's expansion is speeding up?
A.) We've measured it for a long time and seen that galaxies are moving faster with time. B.) We look at objects from different times in the past to see how expansion changes with time. C.) We can see the change in the expansion rate from year to year. D.) We can see the change in the expansion rate from month to month. E.) We can see the change in the expansion rate from week to week.
What is the most compelling piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?
A) a layer of sediment laid down at that time which is littered with dinosaur fossils B) dinosaur fossils are found in rock layers older than 65 million years but not younger than 65 million years C) a layer of sediment laid down at that time which is rich in the element Iridium (Ir), an element common in asteroids but less common on the Earth D) the crater from this impact can still be seen in the deserts of Arizona
The critical temperature to initiate the proton-proton cycle in the cores of stars is:
A) 3,000 K. B) 5,800 K. C) 2,300,000 K. D) 10 million K. E) 100 million K.