Advantages - We will know more about our solar system and our information about the universe will expand.

Disadvantages - Projects to make spaceships to go to space is very expensive and something might go wrong while exploring the solar system like running out of fuel, oxygen, food, and water or the engine malfunctioning, exploding and killing the astronaut.
Advantages:To know more about the solar system and its other planets and stars.
Disadvantages: To know more about the solar system NASA will sure use a lot of money to make thier equipments and the goverment will give much and much more money to NASA. the point is as the goverment gives more money to NASA they will ignore some of the other this we need like road constractions etc.