What are Sun grazers?
a. asteroids that impact the Sun
b. meteors that impact the Sun
c. any celestial body that orbits the Sun
d. asteroids that come in close proximity to the Sun
e. comets that come in close proximity to the Sun
e
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A filtergram is used to study layers below the photosphere
Indicate whether the statement is true or false
In normal use, the image seen through eyeglasses is
A. both virtual and real. B. real. C. virtual.
If a nuclide has a half-life of 100 s, what is the corresponding mean lifetime?
A. 100 s B. 144 s C. 69 s D. 50 s E. 75 s
Neutrinos travel at very high speeds (close to the speed of light). How does this fact imply that neutrinos cannot make up the bulk of the dark matter in galaxies?
A) Their high speeds mean neutrinos cannot have much mass. B) Their high speeds tell us that neutrinos interact only through the weak force and gravity. C) Their speeds of neutrinos mean that neutrinos would escape from galaxies.