WEEK TWO & THREE
Questions & Comprehension:
• Where is the center of the universe?
Nowhere, and everywhere (no one knows)
• Does the universe have edges?
We don’t know
• Astronomers can look back in time and see the past?
Due to the way we measure in light years.
• Distant objects can only be seen as they were in the past, not as they are today.
• This hints that space (distance) and time are closely linked. As Einstein’s theory
• The moon is moving away from us by a pinky size each year.
In 23,000 BC: Egypt, Syria etc… believed Earth to be the center of the universe.
Geocentric System > Teaching of Catholic Cthrch.
Theory of the universe didn’t change until 14 century (until Copernicus).
Copernicus founded the heliocentric system,
o The sun being found in the center was a thought… but it never stuck.
People had no evidence so that theory was rejected.
People believed that the Earth couldn’t rotate b/c if it did we would fly off it.
Everyone believed Earth was fixed in space – and the last thing they imagined
was that the Earth and its atmosphere would make with it…)
o Allowed the ancients to discover that Earth was closer to the sun than
Mars & it made a rotation quicker than Mars.
o These ideas were deemed forbidden & marked the start of the scientific
I. Thycho Brahe (15461601) [Nobleman] – Silver/Metal Nose
He developed the compromise cosmology
Heliocentric and Geometric