Emission nebulae are blue
Indicate whether the statement is true or false
FALSE
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Supermassive black holes erupt in ____
a. any type of galaxy, and at random times b. elliptical galaxies only, when the last of their gas and dust is consumed c. galaxies that have been part of a collision or merger d. spiral galaxies only, during a burst of star formation e. irregular galaxies
If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in
A) a curved path. B) an outward spiral path. C) an inward spiral path. D) a straight-line path.
Which of the sources of error that you cited in question 5 do you think most affected your experiment? Why?
The theory of seafloor spreading is supported by
A) geological, biological, and climatological data. B) paleomagnetic analysis of the ocean's floor. C) the change in Earth's polarity. D) none of these