Answer:
1. Ancient philosophers
2. Church tradition
Explanation:
The middle ages were between the fifth century to the fifteenth century. It was characterized by many things ranges from social-cultural belief to the style of governance, and the understanding of t universe.
During this period, people relied on certain two principal authorities for their understanding of the universe, they are:
1. Ancient philosophers: such as Socrates, plato, etc
2. Church tradition: such as Catholic church etc.
