Chapter 27 Flashcards
consists of the sun, the planets, and all of the other bodies that orbit the sun
solar system
primary bodies that orbit the sun, round because of its own gravity, has cleared the neighborhood around its orbital path
planets
created a geocentric (___ centered) model
Aristotle
Earth
created a model where planets move in small circles called ___
Ptolemy
epicycles
created a heliocentric (___ centered) model
Nicolaus Copernicus
sun
proved that everything did not revolve around the Earth
Galileo Galilei
How did Galileo prove that everything did not revolve around the Earth?
used a telescope to see moons revolve around Jupiter
What are Kepler’s Laws?
1/ Law of Ellipses
2/ Law of Equal Areas
3/ Law of Periods
the degree of elongation of an elliptical orbit (symbol?)
Eccentricity
e
the cube of the average distance of a planet from the sun is always proportional to the square of the period
Law of Periods
planets revolve in ___, not circles
Law of Ellipses
ellipses
the tendency of an object to resist a change in motion unless an outside force acts on the object
inertia
the time required for a body to complete a single orbit
orbital period
equal areas are covered in equal amounts of time as an object orbits the sun
Law of Equal Areas
force of attraction between all objects
gravity
highly dense planets nearest to the sun
inner/terrestrial planets
bowl-shaped depressions where other objects in space have collided with the planet
impact craters
