(T/F) After studying 30 years worth of previous work, Kepler became convinced that the geometry and mathematics could explain the number, distance, and motion of planets.The point of distinction between a long-period comet and a short-period comet is 100 years. It has been determined that spiral galaxies spin ____ as you go toward the center. Based on her observations, the astronomer should infer that the active nucleus of this galaxy is about ____ in diameter.Astronomers believe that the X-ray radiation from the nuclei of active galaxies comes from _____.From the accretion disk around a massive black holeThe majority of galaxies in rich clusters are _____ while poor clusters contain high proportion of _____ galaxies. Applying the modified version of Kepler's 3rd law, if the blackhole is in a binary system The fast rotation of neutron stars is a consequence of _____. A black hole is black because not even light can escape its gravitational field.According to Kepler's secondary law of planetary motion:The speed of a planet is greatest when it is closest to the sun.A planet moving in an elliptical orbit moves __________ when it is farther away from the sun and ___________ when it is closer to the sun.Using the gravitational constant, what units must the orbital period have in order to use this value of G in an equation?For any planet, if the planet were to shrink to one-half the planets original radius but maintain a constant mass, what would happen to the value of g on the planet's surface?g would be four times as large as the original value.For any planet, if the planet were to expand to twice the radius, but maintain a constant mass, what would happen to the value of g on the planet's surface?The value of g would be one fourth its original value. If there is object in orbit around a black hole, astronomers can measure its orbit. (T/F) Tycho Brahe was a Danish astronomer who confirmed Copernicus's theories by making many observations with his telescope. accretion disk. - 16300072 (T/F) Unlike stars and planets, black holes do not spin.Johannes Kepler started his astronomy career as an assistant to ______________.The planets speed up as they come nearer to the Sun and slow down as they move farther from the sun.Describes the relationship between the average orbital radius and the period of a planet.States that all masses in the universe attract all other masses in the Universe.Cavendish's experiment to find the value of G was performed in ________ .An object so massive that light leaving it is bent totally back to the object.
(T/F) Cavendish used the attraction between large and small lead balls to measure an experimental value for the gravitational constant, G.(T/F) The value found for the universal gravitational constant, G, will vary depending on the materials used for the balls of a Cavendish balance. Is Earth closer to the Sun in the winter or in the summer?If the ___________ of an object is increased, the gravitational force it experiences will increase as a result.___________ was the first astronomer to propose that the Sun is the center of the solar system.___________ proposed that the planets orbit the Sun in circular orbits.___________ used huge instruments he built himself to record the exact positions of the planets and stars.___________ used 30 years worth of observations made by other scientists and concluded that the planets orbit the Sun.___________ proposed that the force exerted on a planet by the Sun is inversely proportional to the distance between centers of the planet and the Sun.___________ discovered that the shape of a planet's orbit is an ellipse.___________ was the first to theorize that the force that makes objects fall to Earth is the same force that the Sun exerts on the planets.___________ used geometry and mathematics to discover his three laws of planetary motion.Kepler's ___________ law relates the motion of more than one object about a single body.Kepler's ___________ law describes the shape of the planet's orbits.Kepler's ___________ law states that the Sun is located at one focus of a planet's orbit.Kepler's ___________ law states that an imaginary line drawn from a planet to the sun will sweep out equal areas in equal time intervals.Kepler's ___________ law states that the ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. How is the mass of a black hole determined? if a collapsing star is at least _____ solar masses, it will form a black hole. The mass of a black hole can be determined by ____. Most of these stars are probably _____.The majority of stars in the Milky Way appear to be in the _____.Sir William Herschel counted the number of star's in different directions, and getting similar numbers in each direction along the disk, concluded the Sun was near the center of a disk-like collection of stars. slower. The temperature of black holes is estimated to be ____. ... which part of a black hole can we see? True Like any other object, the strength of the gravitational field generated by a black hole is directly proportional to the mass of the black hole.
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