A large grouping of stars, gas, and dust held together by gravity

Which galaxy is shaped like a large flat disk, a bulge in the middle, and arms

Which galaxy is massive collection of stars with a bright round shape

Which galaxy is a collection of stars, gas, and dust with no specific shape

Giant cloud of dust and gas; stars may form here

Our solar system is located in the ______________ galaxy

Our solar system is located on the outer part of ________________ in the Milky Way galaxy

What do the heliocentric model and the big bang theory have in common?

Which belief is the basis of Ptolemy's geocentric model of the solar system?

The Earth, the Sun, and the seven other planets that are in orbit around the Sun are part of the Solar System. How does the size of the Solar System compare with the size of the Milky Way Galaxy?

Which type of force holds galaxies together?

Our solar system includes the Earth, the Sun, and the seven other planets that are in orbit around the Sun. Which of the following galaxies does our solar system belong to?

Which of the following best describes the position of the Sun in the geocentric model?

Copernicus was the first astronomer to develop a heliocentric model of the Solar System. What is the main idea of heliocentrism?

n past centuries, many people believed in a static Universe—one that had existed forever without changing much, and one that would continue forever more or less as it is today. Which of the following facts supports the big bang theory and disproves

Which of the following theories explains why the Universe is expanding at a great speed?

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