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Bench4 #1-12

Earth and Space Section

QuestionAnswer
What is the term “Big Bang” time and all matter in the universe was created at one moment
According to current evidence, how old is the universe? 13.7 billion years old
How is the Doppler effect used to determine the motion of distant galaxies relative to our galaxies By studying the light emitted from distant galaxies, it has been found that galaxies are moving apart from one another
Blue: they are coming toward us
Red: They are going away from us
According to our estimates, how many stars are there in the Milky Way Galaxy? 100 Billion
What is a nebula? Within galaxies, the spaces between stars are filled with interstellar gas and dust
What are four characteristics of a molecular cloud? Cold Dense Lumpy with regions of varying density The cloud collapses until the central region becomes hot enough
What is a protostar? -A clump of gas that will become a new star
The collapse of a molecular cloud occurs due to what? -Region of the molecular cloud eventually grows dense enough to trap almost all emitted radiation inside of it. Then it the temp dramatically increased.
Nuclear Fusion: is combining nuclei of smaller elements to make nuclei of larger elements
What led scientists to conclude that our Sun is a second-generation star? Generation star, which means its material, came from the explosion of a previously existing star.
List the five characteristics used to classify stars: -Color (blue & red) -Temp -Out put of the star -Distance from earth -Age
How is our sun classified, according to the Hertzsprung-Russell Diagram? -It’s a main sequence star
Created by: mhackett
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