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
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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.
This photo, taken from orbit of Mars, shows a feature known as
A) Olympus Mons B) Valles Marineris C) Ishtar Terra D) Hellas Basin
As an electron moves closer to the nucleus, it ________ energy.
A. generates B. absorbs C. quantizes D. loses E. gains
Which of the following represents the shortest distance?
a. One parsec b. One astronomical unit c. One light-year d. One right ascension