8th Grade Ch. 3 Sec. 6 Is There Life Beyond EarthPresentation Transcript
Ch. 3 Sec. 6 Is There Life Beyond Earth ?
Are we alone?
e xtra t errestrial life
life other than that on Earth
favorable conditions needed for life as we know it liquid water suitable temp. range & atmosphere sunlight or other energy source
temp. not too hot- not too cold
Earth = just right
Extreme Conditions- bacteria in hot springs show that range of conditions in which life can exist - much greater than scientists once thought
covered by layer of ice-possibly liquid H 2 0 under possibly fossils in meteorite Voyager & Galileo missions areas on Mars looked like stream beds w/ paths of water- possible evidence may have had running water moon of Jupiter Viking missions- tested air & soil for signs of life Life on Europa Life on Mars
VIKING ORBITER VIEW OF MARS surface of Mars looks like streambeds w/ crisscrossing paths of water – maybe Mars had flowing water??
possible fossil bacteria in Mars meteorite
Scientists have discussed sending a robotic probe to search for life in the ocean below Europa’s icy crust.
So, is there life beyond Earth? ?????????? ??????????