posted on Jan, 8 2013 @ 01:21 PM
In 1610 a remarkable device was constructed called the telescope. The person that used the telescope was Galileo. That was 402 years ago, shortly to
be 403 years ago.
Galileo made 3 important observations that year that showed the Earth could not be at the center of the universe.
1. He observed the moons of Jupiter
2. He saw Venus had phases like the Moon
3. He tracked a comet across the night sky
These 3 things each told him that whatever the real situation of the cosmos, the Earth could not be at the center of the universe.
The first 2 observations are easy to make and can be done by anyone. What it took to obtain this evidence was a new technological device. The Greeks
knew that there were severe problems with the Earth at the center of the universe. The paths of the planets were complex including retrograde motions.
They knew there was a problem and tried to fix the problem with spheres within spheres. They knew that their changes were not fixing the problem. What
they surmised, but did not demonstrate was that the Sun was at the center of the solar system.