The observed temperature difference between the northern and southern hemispheres of Uranus:
A) is dozens of Kelvins.
B) is hundreds of Kelvins.
C) varies greatly.
D) is about 10 Kelvin.
D
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This x-ray image shows a loop of hot gas above the surface of the Sun. If we took a visible light photo that looked in the Sun's photosphere just under the two points where the loop of gas comes down (arrows), what would we find?
A) sunspots B) bright prominences C) coronal holes D) radiation zones
Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center. B) It is thought to harbor a black hole of more than 3 million solar masses. C) It is a source of bright radio emission. D) It is a source of X-ray emission that we have observed with telescopes in space.
Suppose you find a meteorite made almost entirely of metal. According to current science, which of the following statements must be true?
A) Your meteorite is a fragment of an object from the Kuiper belt. B) Your meteorite is a fragment from the core of a large asteroid that shattered in a collision. C) Your meteorite was blasted off the surface of Mars by an impact. D) Radiometric dating will show the age of your meteorite to date to the formation of our solar system.
Which of the following radionuclides is used to date once-living material?
a. Rubidium-87 b. Potassium-40 c. Thorium-232 d. Carbon-14