1. Search the Web for information about possible manned missions to Mars. How long would such a mission take? How expensive would they be? What are some advantages and disadvantages of a manned...

1. Search the Web for information about possible manned missions to Mars. How long would such a mission take? How expensive would they be? What are some advantages and disadvantages of a manned mission compared to an unmanned one?

2. Observe Venus through a telescope once a week for a month and make a sketch of the planet’s appearance on each occasion. From your sketches, can you determine whether Venus is approaching us or moving away from us?