1) A video shows the object in the solar system orbiting the sun. Why do objects orbit the sun? a) The sun is releasing heat and pushing objects away b) The sun is so bright that objects are forced away. c) The sun is so massive that it has the most gravity. d) The sun is moving so quickly that other objects move around it 2) Suppose a person built a sandcastle of moon sand on the moon. What would that person find there a month later? a) The sandcastle would be much smaller because changing winds would have eroded much of the sand away b) The sandcastle would remain in place the same size that it was because the moon has no wind c) The sandcastle would have grown larger because moon sand particles attract other moon sand particles d) The sandcastle would have grown larger by collecting more sand particles because moon sand is blown by wind. 3) A student creates a diagram comparing the sizes of objects in the solar system. Which two objects are often similar in size? a) asteroids and comets b) comets and planets c) moons and meteors d) planets and meteors 4) How do outer planets differ from inner planets? a) They consist of a mixture of gases and liquid. b) They are smaller than the inner planets. c) They have very large solid surfaces. d) They are not different from inner planets. 5) The table shows properties of some planets in the solar system. a) Jupiter b) Neptune c) Venus d) Mars 6) A student makes a chart about galaxies and mentions that the universe consists of many galaxies such as the Andromeda galaxy and the Milky Way galaxy. Which statement is true about these two galaxies? a) They are both moving away from each other. b) The Milky Way is a spiral galaxy, and the Andromeda galaxy is no c) The Milky Way galaxy is larger than the Andromeda galaxy d) They both exert a strong gravitational pull on each other 7) Why do students and scientists construct scale models of natural phenomena? a) to collect data from natural events b) to correct mistakes in nature c) to define new units of measurement d) to better observe patterns and relationships 8) Which planet is approximately four times larger than the diameter of Venus on a scale model? a) Neptune b) Earth c) Mercury d) Mars 9) How does distance affects gravity? a) Gravity increases with increasing distance. b) Gravity is zero at any point in the solar system. c) Gravity increases with decreasing distance. d) Gravity remains the same regardless of distance. 10) What is being used by scientists to organize Earth’s history? a) fossil record b) layers of rock c) geologic time scale d) mass extinctions

Solar system unit test

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