logging in or signing up Physics103 17 Teobaldo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 110 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 24, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Life in the Solar System: Life in the Solar System Where have all the Martians gone?What is Life?: What is Life? While we can list characteristics of living organisms (and the book does), many non-living systems will exhibit many, if not all, of these characteristics Is life about reproduction? Is a sterile human alive? Maybe it's about arising from reproduction? If we took a copy of you by copying all the atoms of your body, would the copy be alive? The bottom line is: We have no useful definition of life. http://www.lifeinuniverse.org/noflash/Lifedefinition-04-01.html Types of Life on Earth: Types of Life on Earth Origin of Life on Earth: Origin of Life on EarthLife in Extreme Environments: Extremophiles: Life in Extreme Environments: Extremophiles http://www.lifeinuniverse.org/noflash/Extremophiles-04-04-01.htmlWhat do we know?: What do we know? We don’t know exactly what life is. We don’t know exactly how life began. What do we know? Where does life live? Almost everywhere on Earth. What are the requirements for life to exist and thrive? This isn’t too bad. After all, to find life, we first need to know where to look. Step 1: Decide what life needs and identify the places that meet these requirements so we know where to look.What is needed for life?: What is needed for life? The presence of liquid water The elements needed for metabolism and reproduction (biogenic elements) A biologically useful source of energy Suitable environmental conditions http://www.lifeinuniverse.org/noflash/Conditions-04-02.html Limiting factor: Limiting factor Biogenic elements (CHONSP…) are all over the Solar System (even in asteroids and meteorites) Sources of energy: Sunlight (photosynthesis) Many chemical reactions generated by heat Others? Liquid water requires temperatures of 273-373 K (0-100 C). Environment Mainly, no harmful UV rays Bottom Line: Follow the water http://www.sciam.com/specialissues/0398cosmos/0398jakosky.html Follow the Water: Follow the Water What planetary bodies have liquid water? Water needs warmth (273-373 K), so heat is necessary. Where does heat come from in the Solar System? Internal heat Solar heat Tidal heat That lead us to… Earth (duh) Mars Europa http://passporttoknowledge.com/solarsystem/life/water.html Mars: MarsWater on Mars: Water on Mars http://mars.jpl.nasa.gov/science/index.htmlViking mission: Viking missionALH84001: ALH84001Missions to Mars: Missions to Mars 2001 Mars Odyssey 2003 Mars Exploration Rovers 2005 Mars Reconnaissance Orbiter Beyond 2007 Smart Lander and Long-range Rover – as early as 2007 Sample Return – as early as 2011, likely 2014 Europa: EuropaMissions to Europa?: Missions to Europa? http://www.jpl.nasa.gov/europaorbiter/ Questions: Questions How important will it be if we discovered other life in our Solar System? How would we know it wasn’t life from Earth? Is NASA right in concentrating much of its resources on searching for life? (ie., is Europa more important than Io?) You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Physics103 17 Teobaldo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 110 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 24, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Life in the Solar System: Life in the Solar System Where have all the Martians gone?What is Life?: What is Life? While we can list characteristics of living organisms (and the book does), many non-living systems will exhibit many, if not all, of these characteristics Is life about reproduction? Is a sterile human alive? Maybe it's about arising from reproduction? If we took a copy of you by copying all the atoms of your body, would the copy be alive? The bottom line is: We have no useful definition of life. http://www.lifeinuniverse.org/noflash/Lifedefinition-04-01.html Types of Life on Earth: Types of Life on Earth Origin of Life on Earth: Origin of Life on EarthLife in Extreme Environments: Extremophiles: Life in Extreme Environments: Extremophiles http://www.lifeinuniverse.org/noflash/Extremophiles-04-04-01.htmlWhat do we know?: What do we know? We don’t know exactly what life is. We don’t know exactly how life began. What do we know? Where does life live? Almost everywhere on Earth. What are the requirements for life to exist and thrive? This isn’t too bad. After all, to find life, we first need to know where to look. Step 1: Decide what life needs and identify the places that meet these requirements so we know where to look.What is needed for life?: What is needed for life? The presence of liquid water The elements needed for metabolism and reproduction (biogenic elements) A biologically useful source of energy Suitable environmental conditions http://www.lifeinuniverse.org/noflash/Conditions-04-02.html Limiting factor: Limiting factor Biogenic elements (CHONSP…) are all over the Solar System (even in asteroids and meteorites) Sources of energy: Sunlight (photosynthesis) Many chemical reactions generated by heat Others? Liquid water requires temperatures of 273-373 K (0-100 C). Environment Mainly, no harmful UV rays Bottom Line: Follow the water http://www.sciam.com/specialissues/0398cosmos/0398jakosky.html Follow the Water: Follow the Water What planetary bodies have liquid water? Water needs warmth (273-373 K), so heat is necessary. Where does heat come from in the Solar System? Internal heat Solar heat Tidal heat That lead us to… Earth (duh) Mars Europa http://passporttoknowledge.com/solarsystem/life/water.html Mars: MarsWater on Mars: Water on Mars http://mars.jpl.nasa.gov/science/index.htmlViking mission: Viking missionALH84001: ALH84001Missions to Mars: Missions to Mars 2001 Mars Odyssey 2003 Mars Exploration Rovers 2005 Mars Reconnaissance Orbiter Beyond 2007 Smart Lander and Long-range Rover – as early as 2007 Sample Return – as early as 2011, likely 2014 Europa: EuropaMissions to Europa?: Missions to Europa? http://www.jpl.nasa.gov/europaorbiter/ Questions: Questions How important will it be if we discovered other life in our Solar System? How would we know it wasn’t life from Earth? Is NASA right in concentrating much of its resources on searching for life? (ie., is Europa more important than Io?)