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| P l e a s e c o n s i d e r m a k i n g a d o n a t i o n . W e a r e 1 0 0 % u s e r s u p p o r t e d a n d d e p e n d o n d o n a t i o n s f r o m u s e r s l i k e y o u . Y o u r d o n a t i o n k e e p s t h e s i t e u p a n d r u n n i n g a n d s u p p o r t s f u t u r e e n h a n c e m e n t s . |
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| The study of life in the universe. (The study of life that evolved outside of the Earth) |
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| A firm belief in something for which there is no proof |
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| The result of perception, learning and reasoning |
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| Something that furnishes proof |
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| Capable of being tested (verified or falsified) by experiment or observation |
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| Carbon, hydrogen, oxygen, and nitrogen |
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| Motion, reproduction, consumption, growth, and stimulus response |
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| 5 characteristics of life |
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| Does not need liquid water to live |
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| Life uses energy to maintain an internal state |
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| Many places outside of Earth where building blocks of life evolved |
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1. A microscopic particle that can infect the cells of a biological organism
2. Viruses can replicate themselves only by infecting a host cell
3. They therefore cannot reproduce on their own |
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Availability of liquid water
An energy source
Protection from harmful radiation
Appropriate raw materials
A stable environment |
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| What life seems to require |
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| Search for intelligent life |
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| Biosignatures of Earth life |
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Oxygen and methane in the atmosphere
Uses energy from the environment
Gives off waste products |
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Discovery that many stars have planets (detected by gravitational wobble of the star)
Many of these planets probably exist in the habitable zones and have liquid water
Organic molecules found in inter-stellar gas clouds
Rapid rise of life on earth and the extreme conditions in which it thrives |
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| Evidence for extra-terrestrial life |
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| Organisms living in places once considered extreme and unhabitable |
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| Gives a mean of estimating the number of civilizations capable of communication that are in the Milky Way Galaxy |
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| Locations of possible life in our solar system |
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| Earth, Europa, Titian, Mars |
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| Most extra-terrestrial life will be single cell organisms |
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Active volcanoes
Large moon
Atmosphere
Liquid water
Tons of CHON |
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