The ________ blows out of the coronal holes
Fill in the blank(s) with correct word
solar wind
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The following images show the four terrestrial planets in our solar system. Rank the planets from left to right based on the amount by which the greenhouse effect increases their surface temperatures, compared to what their temperatures would be without the greenhouse effect, from largest to smallest increase.
Pluto is most similar to:
A) Europa. B) Miranda. C) Triton. D) our Moon. E) Mercury.
Which of the following is not a piece of evidence supporting the conclusion that active galactic nuclei are powered by accretion disks around massive black holes?
A) The total amount of radiation coming from the galactic center can, in some cases, exceed 100 times the total luminosity of the Milky Way Galaxy. B) Infrared observations show that many stars are forming near the centers of active galaxies. C) Observed radiation from the galactic center can vary significantly in brightness in times as short as a few days. D) Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed. E) Radio observations sometimes show long jets of material that can extend millions of light-years out from the galactic center.
A friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no tricks. You
A) agree that it can't be done. B) have reservations about this assertion. C) disagree, for a good punch easily delivers this much force.