Someone plz help 1. What are the differences between the geocentric model of the solar system
and the heliocentric model of the solar system? When were these two
models used and why did they change from one to the other?
2. How could you create or design a new calendar? What would you think
about when developing a new type of calendar? Explain your thinking.
3. How are Yuri Aleksey Gagarin and Alan Shephard's accomplishments
similar? How are they different?
4. Compare and contrast the Apollo 13 mission and the ill-fated Challenger
flight. Why were each significant?
5. How do you think a Soviet astronaut would have viewed the Apollo 11
mission as it was taking place? Support your answer.