1. If Earth did not have a magnetic field, do you think auroras would be more common or less common than they are today? Explain. 2. Identify and compare the advantages and disadvantages of lunar...

1. If Earth did not have a magnetic field, do you think auroras would be more common or less common than they are today? Explain.

2. Identify and compare the advantages and disadvantages of lunar exploration by astronauts as opposed to mobile, unmanned instrument packages and robots.