Some narrow rings of Saturn are seen in space probe photos to be caused by
a. gravitational interactions between ring particles.
b. a spiral density wave which confines them.
c. the magnetic field which holds them in place.
d. small shepherd moons that orbit inside and outside the rings
d
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Discuss the evidence that supports the theory that there is a supermassive black hole at the center of our galaxy
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Collisions between galaxies:
A) are much rarer than collisions between stars. B) can turn elliptical galaxies into spirals. C) cause large numbers of stars to collide and explode. D) cause the gas and dust clouds to collide, leading to rapid star formation. E) are the best explanation for gamma-ray burst events.
Which statement about antimatter is not true?
A) An antielectron (positron) is identical to an ordinary electron except it has a positive charge. B) Every ordinary particle has a corresponding antiparticle. C) When a particle and its antiparticle meet, the result is mutual annihilation that turns all of the mass into energy. D) Antimatter has been hypothesized to exist but has never actually been detected.
At the moment of a total eclipse, the moon lies along a line from the Earth to the Sun. If your normal weight is 600 N, how much is your weight decreased by the combined pull of the Sun and Moon? MSun = 2.0 × 1030 kg,rS-E = 1.5 × 108 kmMMoon = 7.4 × 1022 kg,rM-E = 3.8 × 105 km
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