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What observed feature of the Milky Way is better explained by the bottom-up hypothesis of galactic formation, as opposed to the monolithic collapse model?a.​The different metallicities of the bulge and disk of the galaxyb.​The supermassive black hole found at center of the galaxyc.​The elongated shape of the central bulge of the galaxyd.​The difference in age of globular clusterse.​The very little gas or dust that halo contains

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Which ancient Greek thinker suggested (long before Copernicus) that the Earth is moving around the Sun?- Eratosthenes- Aristarchus- Hipparchus- Aristotle- Zorba
In Ptolemy's system the planets orbit the Earth and not the Sun. How did the system explain the retrograde motion of planets like Jupiter?- the Sun moved among the planets, and pulled them out of their circular orbits- the planets were not moving along the ecliptic but all over the celestial sphere- the planets moved in very elongated ellipses, and their speed in orbit changed radically over the course of a year- you can't fool me, Ptolemy's system did not include ANY explanation of retrograde motion- the planets moved on a small circle whose center, in turn, circled a point near the Earth
The great astronomer of ancient times who summarized and improved a system of circles upon circles to explain the complicated motions of the planets (and published the system in a book now called The Almagest) is:- Copernicus- Pythagoras- Alfonso the Wise- Hipparchus- Ptolemy

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