1 Web Search What is a solar system? How does a solar system hold together? Can you see how a solar system works represented here?here 2 Web Search When did humans begin exploring outside of Earth? 3 Web Search How much money does space exploration cost? 4 Web Search How much time did it take to complete the project that got an exploratory unit to Mars? 5 Thinking Is space exploration worth the time and money? 1 Web Search What is a solar system? How does a solar system hold together? Can you see how a solar system works represented here?here 2 Web Search When did humans begin exploring outside of Earth? 3 Web Search How much money does space exploration cost? 4 Web Search How much time has NASA spent exploring Mars? 5 Thinking Is space exploration worth the time and money? 1 Web Search What is a solar system? How does a solar system hold together? Can you see how a solar system works represented here?here 2 Web Search When did humans begin exploring outside of Earth? 3 Web Search How much money does space exploration cost? 4 Web Search How much time has NASA spent exploring Mars? 5 Thinking Is space exploration worth the time and money? 1 Web Search What is a solar system? How does a solar system hold together? Can you see how a solar system works represented here?here 2 Web Search When did humans begin exploring outside of Earth? 3 Web Search How much money does space exploration cost? 4 Web Search How much time has NASA spent exploring Mars? 5 Thinking Is space exploration worth the time and money? 1 Web Search What is a solar system? How does a solar system hold together? Can you see how a solar system works represented here?here 2 Web Search When did humans begin exploring outside of Earth? 3 Web Search How much money does space exploration cost? 4 Web Search How much time has NASA spent exploring Mars? 5 Thinking Is space exploration worth the time and money? 1 Web Search What is a solar system? How does a solar system hold together? Can you see how a solar system works represented here?here 2 Web Search When did humans begin exploring outside of Earth? 3 Web Search How much money does space exploration cost? 4 Web Search How much time has NASA spent exploring Mars? 5 Thinking Is space exploration worth the time and money? 1 Web Search What is a solar system? How does a solar system hold together? Can you see how a solar system works represented here?here 2 Web Search When did humans begin exploring outside of Earth? 3 Web Search How much money does space exploration cost? 4 Web Search How much time has NASA spent exploring Mars? 5 Thinking Is space exploration worth the time and money?