In 1687, _____ explained that gravitational forces hold the solar system together.
What may have been the first step in the formation of the solar system?
What kind of material was able to survive near the Sun during the development of the solar system?
Kepler correctly proposed that the planets orbited the sun in _____ orbits.
The nebular model explains
According to the current theory, the Earth's moon was formed __________.
Aristotle first proposed that _____ was at the center of the solar system.
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