Question	Answer
What does the solar system contain?	the sun, planets, and all other bodies that revolve around the sun
What planets are characterized by solid rock with metallic cores, zero to two moons, and impact craters?	inner planets
Which principle states that each planet orbits the sun in a closed curve whose shape is determined by two foci?	Kepler’s law of ellipses
What are small bodies from which planets originated in the early stages of development of the solar system?	planetesimals
Which astronomer believed that planets revolve around the sun, but at different speeds and distances from it?	Copernicus
Which planets are characterized by massive size, relatively low density, thick atmospheres of helium and hydrogen, and rock and metal cores?	outer planets
Which law states the cube of the average distance of a planet from the sun is proportional to the square of its orbital period	Kepler’s law of periods
Name the principle that states equal areas are covered in equal amounts of time as an object orbits the sun.	nebular hypothesis
What is the name of the theory that explains how the sun and planets condensed at about the same time out of a rotating cloud of gas and dust?	differentiation
Which astronomer believed that planets move in epicycles as they move in larger circles around the Earth?	Ptolemy
the process by which Earth formed three distinct layers: a dense core of iron and nickel, a thick layer of iron- and magnesium-rich rock, and a thin crust of silica-rich rock	differentiation
The sun and all of the planets and other bodies that revolve around it make up the _______________________.	solar system
Celestial bodies that orbit the sun, such as Earth and Jupiter, are called ______________.	planets
In 1796, the French mathematician Pierre-Simon, marquis de Laplace, advanced the ____________________ to explain the origins of the solar system.	nebular hypothesis
Laplace’s hypothesis states that the sun and the planets condensed at about the same time out of a rotating cloud of dust and gas called a	nebula.
The rotating cloud of dust and gas from which our solar system is thought to have formed is called the	solar nebula.
Energy from collisions and pressure from gravity caused the center of the solar nebula to become	hotter and denser.
Which of the following formed when the temperature at the center of the nebula reached about 10,000,000°C and hydrogen fusion began?	the sun
How much of the matter that was contained in the solar nebula makes up the sun?	about 99%
Small bodies from which a planet originated in the early development of the solar system are called	planetesimals.
Some planetesimals joined together through collision and through the force of gravity to form larger bodies called	protoplanets.
The smaller bodies that orbit the planets are called	moons.
Why are Mercury, Venus, Earth, and Mars called the inner planets?	because they are closest to the sun
Why did the inner planets, which contained large percentages of heavy elements such as iron and nickel, lose their less dense gases?	the planet's gravity was not strong enough to hold the gases, which may have been boiled or blown away
How do the surfaces of the inner planets compare with that of Earth today?	similar to that of Earth today
How do the inner planets differ from the outer planets?	they are smaller rockier, and denser than the outer planets

Flashcards

Matching

Hangman

Crossword

Unscramble

Chopped

Type In

Quiz

Test

StudyStack

Study Table

Bug Match

Hungry Bug

Targets

Apps

Hmm...

Print

Edit