rare planet
-search of intellegent
telescope in north america, looking deep into space
nothing is found
-milky way
billions stars in this galaxy
billions galaxies out there
------------------------
new theory
-rare earth theory
simple life like bacteria
common in universe
but complex animals require series of events to create
-------------------------
most important day in earth histrory
chance event
-50 millions years after formed.
1.theia(twin of earth) catastrophic collision between them.
theia was destroyed, became a ring of rocks surrounding earh.
creating magnetic shield to protect earth from solar wind.
if there wasn't this collision, earth will not be secure for life.
2.location.
too far from the sun. ex. mars- too cold for life
closer ex. earth- right temperature for water.
too close ex. vinus-too hot, water boiled away.
only place to support life, and earth is the only planet there
3. right sun
4 million tons of the sun is converted into energy every second.
larger the star is, quicker the planet dies.
suns long life make that possible
4. jupiter (300 times bigger than earth)
massive gravitation field. drive planet that may hurt earth away.
protects the earth.
without it, earth can be hit every 10000 years.
---------------------------
too stable evolution will be too slow.
catastrophe is needed for evolution
ex. junbles of mexico
evidence of this catastrophe.
-holes called cenotes.
cave with water in it. they dive to see in the water.
form tunnels and caves
cenotles scatterred in the forest can seen from the air, they form half a circle. they reveal a colosiral impact.(65million years ago)
-chicxube meteorite(陨石名字)
size 15 miles across
power of 100 million million tons of TNT
created half a mile hole into the earth crust
blast plumes fell back to earth.
fires everywhere------dinersours died.
underground survivors
-----------half done
telescope in north america, looking deep into space
nothing is found
-milky way
billions stars in this galaxy
billions galaxies out there
------------------------
new theory
-rare earth theory
simple life like bacteria
common in universe
but complex animals require series of events to create
-------------------------
most important day in earth histrory
chance event
-50 millions years after formed.
1.theia(twin of earth) catastrophic collision between them.
theia was destroyed, became a ring of rocks surrounding earh.
creating magnetic shield to protect earth from solar wind.
if there wasn't this collision, earth will not be secure for life.
2.location.
too far from the sun. ex. mars- too cold for life
closer ex. earth- right temperature for water.
too close ex. vinus-too hot, water boiled away.
only place to support life, and earth is the only planet there
3. right sun
4 million tons of the sun is converted into energy every second.
larger the star is, quicker the planet dies.
suns long life make that possible
4. jupiter (300 times bigger than earth)
massive gravitation field. drive planet that may hurt earth away.
protects the earth.
without it, earth can be hit every 10000 years.
---------------------------
too stable evolution will be too slow.
catastrophe is needed for evolution
ex. junbles of mexico
evidence of this catastrophe.
-holes called cenotes.
cave with water in it. they dive to see in the water.
form tunnels and caves
cenotles scatterred in the forest can seen from the air, they form half a circle. they reveal a colosiral impact.(65million years ago)
-chicxube meteorite(陨石名字)
size 15 miles across
power of 100 million million tons of TNT
created half a mile hole into the earth crust
blast plumes fell back to earth.
fires everywhere------dinersours died.
underground survivors
-----------half done
