Unit 1 Space Review

What best explains Earth's motion?

• Earth moves in an elliptical motion around the Sun

• No unbalanced force acting on the planet

• The sun moves in orbit around Earth

• The gravitational forces are equal between Earth and the Sun

What is a natural satellite?

• Natural satellites orbit planets

• Planets orbit natural satellites

• Natural satellites have life on them

• Natural satellites are larger than planets

What causes planets to travel along a curved path instead of moving in a straight line?

• Electromagnetic attraction

• Gravitational attraction between the planet and Sun

• Electromagnetic attraction between the planet and Sun

• Gravitational attraction between the moon and planet

Which of these characteristics is the most similar among the planets?

• mass

• shape of orbit

• number of satellites

• chemical composition

The force that holds planets in orbit around the sun is

• motion

• gravity

• friction

• motion

How were space shuttles different than early space vehicles?

• early space vehicles could carry people

• early space vehicles were not reuseable

• early space vehicles were not able to travel far

• early space vehicles were safer

If NASA sends a probe to Jupiter, Venus, or Pluto; Which would experience the strongest gravitational pull ?

• the Jupiter probe

• the Venus probe

• the Pluto probe

• they would all be the same

How is the Earth different from the other planets?

• it rotates on its axis

• it has a rocky surface

• it has a breathable atmosphere

• it is warmed by the Sun

How would scientists predict when a comet would collide with a planet?

• know what the planet is made up of

• understand the gravitation attraction between the comet and planet

• know how comets form

• know the magnetic poles of the planet

If an astronaut could be gone to Mars for 21 months, what would be most important for their survival?

• a heat shield to protect during re-entry to the Earth's atmosphere

• exercise equipment to keep their muscles and bones healthy

• space suits to work in extreme temps

• a countdown clock to show how much time remains on their trip