What is the Roche limit?
A. the distance astronomers can see into a planet's clouds
B. the greatest distance from a planet that its satellites can orbit without falling into the Sun
C. the mass a planet must exceed to have satellites
D. the distance at which a moon held together by gravity may be broken apart by the planet's gravitational attraction
Answer: D
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What will be an ideal response?
Starburst galaxies are invisible in the infrared range
Indicate whether the statement is true or false
Tonight, your telescope shows you RXJ1800, a galaxy, very near in the sky to the bright star Vega. What can you conclude from this observation?
A) Vega and RXJ1800 must be very close to each other, less than a few light years. B) RXJ1800 and Vega will drift apart from each other on the sky, over a matter of nights. C) Vega orbits the center of mass of RXJ1800. D) RXJ1800 and Vega will set in the west, at very similar times.
A tennis player standing 12.6 m from the net hits the ball at 3.00° above the horizontal. To clear the net, the ball must rise at least 0.330 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racket?