The birth of stars is a battle between gravity and radiation pressure
Indicate whether the statement is true or false
TRUE
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This diagram represents a star with an orbiting planet that, as seen from Earth, periodically transits across the face of the star and disappears behind the star. If you measure the brightness of this system, at which point would it be brightest?
A) Point 1 B) Point 2 C) Point 3 D) Point 4
These diagrams represent four possible models for the universe. Which model presumes the existence of some type of dark energy in the universe?
A) accelerating universe B) coasting universe C) critical universe D) recollapsing universe E) All four models assume the existence of dark energy.
What is Hawking radiation?
A) a hypothesized way for black holes to gradually shrink in mass B) a type of high-energy radiation that comes from inside a black hole's event horizon C) a type of radiation coming from objects supported by degeneracy pressure D) a type of radiation that we have detected so far only with infrared telescopes in space
Galaxies that are far away from us have spectra that are redshifted more than galaxies that are closer to us. It is thought that the reason for this is that
A. the stars in more distant galaxies are older and cooler than those nearby. B. we are at the center of an expanding universe. C. we are at the edge of the universe and moving away from the center. D. space itself is expanding.