3. geocentric universe refers to the belief to that the Earth is the center of the universe. A geocentric view resulted in a limited knowledge of our universe, but when it became widely accepted that the sun was the center of our solar system, the scientific community made leaps and bounds towards the understanding of the universe we have now. Now we know that we're but one solar system, among countless others.
8. Currently, it would take far to long to send a spacecraft to other stars to really make it a feasible option for detecting life on other planets. We can however, use current telescope technology to detect extrasolar planets, and as technology advances, we may be able to receive better images to look for and understand visual signs of possible life.
13. (a) the ancient idea that Earth resided at the center of the universe.
Geocentric, geo meaning Earth & centric meaning centered, describes an Earth centered view of the universe.
18. (c) evidence suggests that Mars had liquid water on its surface in the distant past.
Water is one of the basic necessities for life (as we know it), but it is important that it's liquid water. Liquid water is needed for life (as we know it), so a planet like Mars must have the proper conditions to facilitate liquid water.
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