This person developed his own model in which the Sun and Moon orbited Earth and the planets circled the Sun

a. Galileo b. Newton
c. Kepler d. Tycho


d

Physics & Space Science

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This photo, taken from orbit of Mars, shows a feature known as

A) Olympus Mons B) Valles Marineris C) Ishtar Terra D) Hellas Basin

Physics & Space Science

Which of the following represents the shortest distance?

a. One parsec b. One astronomical unit c. One light-year d. One right ascension

Physics & Space Science

The terrestrial planets are thought to have formed by accreting solid planetesimals all with about the same composition. This means

a. they were initially molten forming an iron core first, then they accreted a silicate crust later. b. they were initially molten forming a silicate core first, then they accreted an iron crust later. c. they were initially collections of solid particles which melted then differentiated into a high density iron metal core and low density silicate crust. d. they were initially collections of solid particles which melted then differentiated into a high density silicate core and low density iron metal crust.

Physics & Space Science

As an electron moves closer to the nucleus, it ________ energy.

A. generates B. absorbs C. quantizes D. loses E. gains

Physics & Space Science