Formation and Motion of Galaxies

Matter with indefinite shape and volume

The Sun and the group of planets that revolve around it

Large mass of stars

Tiny particles of matter floating in space

Force pulling objects toward one another

Based on the pattern in the data, we can predict that the period of Mars’ orbit will be–

Gravity is responsible for which of the following characteristics of a galaxy?

Which of the following best describes the formation of the solar system?

Earth and its solar system are a part of which of the following galaxies?

Students are making a model of planetary motion. The students tie a tennis ball to a string. The string passes through a spool and is attached to a 1 kilogram mass.

The mass pulls down on the string as the students spin the tennis ball around the spool. If the students wish to change the model to show what would happen if the sun had a greater gravitational pull, what change should they make?