Uranus was discovered
A) after examining perturbations in Neptune's orbit.
B) less than 250 years ago.
C) thousands of years ago.
D) by Galileo.
E) with a radio telescope.
B
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Sgr A* emits radio waves
a. True b. False Indicate whether the statement is true or false
How can asteroids be distinguished from stars in telescope observations?
A) Asteroids move relative to the stars. B) Asteroids are much dimmer than stars. C) Asteroids are much redder than stars. D) Asteroids are much brighter than stars. E) Asteroids are not spherical.
Observations have shown that when the mass of the central black hole is large, then
A) the mass of the halo and disk of the host galaxy is also large. B) the host galaxy is eventually completely consumed by the black hole. C) the galaxy is always a spiral galaxy. D) the mass of the bulge of the host galaxy is also large.
Find the frequencies of the first three harmonics of a 1.0-m long string which has a mass per unit length of 2.0 × 10^?3 kg/m and a tension of 80 N when both ends are fixed in place