Space Exploration

1.1 - What do we understand about celestial bodies?

1.2 - How have our views of the solar system changed?

1.3 - How have telescopes been used to increase our understanding of space?

1.4 - How can the composition of a star be determined using spectroscopy?

2.1 - What other techniques are used to determine more accurate information about celestial bodies?

2.2 - How does Earth compare to other celestial bodies?

2.3 - What are some accomplishments/issues/problems associated with space travel?