Name of the theory of Ptolemy's universe

His laws state that the planets move in ellipses instead of circles

Pluto's orbit and other objects like it are called dwarf planets

Location where a planet is furthest away from the sun

Discovered a model of the solar system where the inner planets move faster than the outer planets, explained retrograde

Distance from the Earth to the Sun

A dense concentration of material at the center of the solar system eventually became

What is NOT a step in the life of a star that is 1000x's our sun's mass

In the universe, if a star or galaxy is red shifted it

The HR diagram relates what two properties of stars?

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