Question

what is one astronomical unit (au)? a) the distance from earth to the moon b) the distance from earth to the sun c) the diameter of the sun d) the radius of earth which planets are considered gas giants? a) mercury and venus b) earth and mars c) jupiter and saturn d) uranus and pluto if a scale model sun is 1 meter wide, which planet would be closest to it? a) mars b) venus c) earth d) mercury which statement describes the limitation of a solar - system model? a) models can show exact sizes and distances. b) models help us see objects too large to measure. c) models always show everything to true scale. d) models cannot represent distance and size accurately at the same time why is using a scale model helpful for understanding the solar system? a) it shows distances and sizes we cannot see in real life. b) it proves planets move in straight lines. c) it makes gravity stronger. d) it keeps planets closer together.

Explanation:

1. An Astronomical Unit (AU) is defined as the average distance from Earth to the Sun.
2. Jupiter and Saturn are the well - known gas giants in our solar system.
3. Mercury is the closest planet to the Sun, so in a scale model it would be closest to the model Sun.
4. Solar - system models cannot represent distance and size accurately at the same time due to the vast differences in scale.
5. Scale models are helpful because they show distances and sizes that are too large to see in real life.

Answer:

1. b) The distance from Earth to the Sun
2. c) Jupiter and Saturn
3. d) Mercury
4. d) Models cannot represent distance and size accurately at the same time
5. a) It shows distances and sizes we cannot see in real life.