A human-operated spaceship reaches the moon in 3 days. The moon is about 386,400 km from Earth. Mars, our closest planetary neighbor, is, at its closest, about 140 times farther away from us than the moon if Mars stays in place. Assuming a very simple model of the solar system, about how long would it take that same spaceship to reach Mars?(1 point)
Responses
about 7.5 years
about 7.5 years
about 2.5 years
about 2.5 years
about 1 year
about 1 year
about 22.5 years
about 2.5 years
What is the main problem with this model if it were going to be used to study the dimensions of the solar system?
(1 point)
Responses
The planets are depicted in different colors.
The planets are depicted in different colors.
The planets are placed at the same distance from each other.
The planets are placed at the same distance from each other.
The planets are shown as having different shapes.
The planets are shown as having different shapes.
The planets are represented in different sizes.
The planets are placed at the same distance from each other.
Why do astronomers use astronomical units (AU) instead of kilometers (km)?(1 point)
Responses
AU is used for spacing, while km is used for length.
AU is used for spacing, while km is used for length.
Large distances are easier to express in AU than in km.
Large distances are easier to express in AU than in km.
There are no km in outer space, only AU.
There are no km in outer space, only AU.
AU is used in astronomy, while km is used in physics.
Large distances are easier to express in AU than in km.
What would missing data do to the accuracy of a model?(1 point)
Responses
Missing data would not affect a model’s accuracy.
Missing data would not affect a model’s accuracy.
Missing data would make a model accurate.
Missing data would make a model accurate.
Missing data would make a model inaccurate.
Missing data would make a model inaccurate.
Missing data would enhance a model’s accuracy.