Why do astronomers believe that there is a large black hole, around 4 million times the mass of our Sun, in the Galactic center?
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Observations of the Galactic center show a large amount of energy being produced. Radio observations show a ring of gas with a high rotation speed around the center, showing a very large mass. The structure seen in higher resolution radio observations is peculiar. These observations are consistent with an accretion disk around a supermassive black hole.
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In the cosmological principle, ________ implies that the direction the observer faces makes no difference on the grandest scale
Fill in the blank(s) with correct word
How did the Copernican model explain the apparent retrograde motion of the planets?
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A high-speed dart is shot from ground level with a speed of 150 m/s at an angle 30° above the horizontal. What is the vertical component of its velocity after 4.0 s if air effects can be neglected?
A) 150 m/s B) 36 m/s C) 130 m/s D) 75 m/s E) 38 m/s
A spaceship from another galaxy passes over the solar system directly above a radial line from the sun to the Earth. (We measure that distance to be 1.5 × 10^11 m.) On Earth, the spaceship is observed to be traveling at a speed of 0.80 c, for which ? = 5/3 . As measured on Earth it takes the spaceship 625 seconds to travel from the sun to Earth. When a scientist in the spaceship measures the
Earth-sun distance and the time it takes her to travel that distance, she finds the results are respectively a. 9.0 × 10^10 m; 375 s. b. 9.0 × 10^10 m; 625 s. c. 1.5 × 10^11 m; 625 s. d. 2.5 × 10^11 m; 625 s. e. 2.5 × 10^11 m; 1042 s.