Earth part 3

What is Life? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Life Would you know it if you saw it?

A virus? ,[object Object],[object Object],[object Object],Ebola virus

The potato that’s been in the cupboard for 3 weeks? ,[object Object],[object Object],[object Object]

A human ovum (egg cell)? ,[object Object],[object Object],[object Object]

Blood? ,[object Object],[object Object],[object Object]

A embryo frozen at a fertility clinic? ,[object Object],[object Object],[object Object],1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

An apple seed? ,[object Object],[object Object],[object Object]

Your fingernails? ,[object Object],[object Object],[object Object]

Brief History of Life on Earth ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Necessities for Life ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Necessities for Life ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Hardest to find on other planets

THE GOLDILOCKS THEORY Too Hot Too Cold Just Right G O Giant Stars M Dwarf Stars 273K 373K Liquid H2O We are lucky enough to be living in just the right place for life to exist, in what is called in astronomy a habitable zones. Terrforming

Earth’s Alternative Biology ,[object Object],[object Object],[object Object],[object Object]

Life in Unexpected Places (Extremophiles) ,[object Object],[object Object],[object Object],[object Object],[object Object],Poison tolerant Salt tolerant Acid tolerant Alkali tolerant Radiation tolerant Lives in minerals No sunlight No oxygen

Types of Extremophiles Types of Extremophiles

More Types of Extremophiles ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

EXTREME PROKARYOTES Sample Hyperthermophiles Thermus aquaticus 1  m Pyrococcus abyssi 1  m Frequent habitats include volcanic vents and hot springs, as in the image to the left

1. Hyperthermophiles ,[object Object],[object Object],[object Object],[object Object],The red on these rocks is produced by Sulfolobus solfataricus, near Naples, Italy

[object Object],[object Object],[object Object],[object Object],[object Object],Deep-sea floor A black smoker, i.e. a submarine hot spring, which can reach 518- 716°F (270-380°C)

2. Psychrophiles Some microorganisms thrive in temperatures below the freezing point of water (this location in Antarctica) Some people believe that psychrophiles live in conditions mirroring those found on Mars – but is this true?

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Characteristics of Psychrophiles

3. Oligotrophs ,[object Object],[object Object],[object Object]

4. Barophiles ,[object Object],[object Object],A sample of barophilic bacteria from the earth’s interior 1  m

6. Halophiles ,[object Object],[object Object],[object Object],Deinococcus

7. Xerophiles ,[object Object],[object Object],[object Object]

Pace of Evolution ,[object Object],[object Object],[object Object],[object Object],[object Object]

What do we know? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is needed for life? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Limiting factor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Follow the Water ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Earth part 3

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Earth part 3

Editor's Notes