tekilamockingbird:

Hey guys!  Another great ask by amomentarylapseof asked for a post about the creation of uranium. 

Type Ia supernova

Type Ia’s occur when a star that is within a few solar masses of our sun reaches the end of its lifetime and becomes a white dwarf.  If there is a star in its giant phase nearby then the white dwarf can accrete some of the hydrogen from the giant star onto itself and begin fusion again.  When the fusion ignites it explodes off the surface of the white dwarf causing the nova.  Many reactions can occur during this process, like rapid neutron capture for example, and some are capable of creating uranium. 

Type II supernova

Type II supernovae can occur when a star is 8-50x the size of our sun.  In stars of this size many elements are produced, some synthesize all the way up to iron.  At this point, the star is in a supergiant phase and being held up by electron degeneracy pressure.  When gravity overcomes this the atmosphere collapses, and bounces off the solid core, blowing out in a large nova.  This can also start a rapid neutron capture process (r-process) which can create uranium. 

What’s this rapid neutron capture you keep mentioning?

Supernova explosions are capable of producing many highly energetic neutrons in a small space.  When gravity overcomes degeneracy pressure it starts an endothermic (energy consuming) process.  Protons in nuclei capture electrons and turn into neutrons.  This happens until you have a significant amount of neutrons, and then a stable situation of neutron degeneracy pressure occurs.  The rest of the infalling material bounces off this and a shockwave goes outward.  This shockwave goes through many layers (dense neutron gas, stabilized iron, the still burning  silicon, oxygen, carbon, helium, and hydrogen, and then non-fusing hydrogen.  As the shockwave travels through these layers many reactions occur including the r-process.  The r-process (r standing for rapid) is necessary for making very heavy elements such as uranium.  It references the beta minus decay time in which a neutron in the nucleus decays into a proton and emits an electron and a neutrino.  Because this process is more rapid it allows a large number of neutrons to accumulate and form heavier elements.

Phew! I had to do a lot of research for this one.  Thanks for the great ask!  Anything you want to see?  Message me!

oxfamgb:

We’ve all heard about Israel’s blockade of Gaza, but what does it actually mean? For many people it could mean no income, no chance of seeing family… and no means of escape.  That’s why we’re calling for a permanent lifting of the blockade, so the people of Gaza can travel, trade and live in dignity. REBLOG this if you agree the people of Gaza should be free.

oxfamgb:

We’ve all heard about Israel’s blockade of Gaza, but what does it actually mean? For many people it could mean no income, no chance of seeing family… and no means of escape.

That’s why we’re calling for a permanent lifting of the blockade, so the people of Gaza can travel, trade and live in dignity.

REBLOG this if you agree the people of Gaza should be free.

RMNP - Emerald Lake / Glacier Gorge Trail to Lake Haiyaha w/ Zach (part eleven)

(Pics taken 9/13/14)

Beautiful sunny / cool day in Rocky Mountain Nat’l park. Visiting Lake Haiyaha and Chaos Creek

RMNP - Emerald Lake / Glacier Gorge Trail to Lake Haiyaha w/ Zach (part ten)

(Pics taken 9/13/14)

Beautiful sunny / cool day in Rocky Mountain Nat’l park. Visiting Lake Haiyaha and Chaos Creek

RMNP - Emerald Lake / Glacier Gorge Trail to Lake Haiyaha w/ Zach (part nine) Lake Haiyaha

(Pics taken 9/13/14)

Beautiful sunny / cool day in Rocky Mountain Nat’l park. Visiting Lake Haiyaha and Chaos Creek

RMNP - Emerald Lake / Glacier Gorge Trail to Lake Haiyaha w/ Zach (part eight)

(Pics taken 9/13/14)

Beautiful sunny / cool day in Rocky Mountain Nat’l park. Visiting Lake Haiyaha and Chaos Creek

RMNP - Emerald Lake / Glacier Gorge Trail to Lake Haiyaha w/ Zach (part seven) Ancient Pinon Pine

(Pics taken 9/13/14)

Beautiful sunny / cool day in Rocky Mountain Nat’l park. Visiting Lake Haiyaha and Chaos Creek

RMNP - Emerald Lake / Glacier Gorge Trail to Lake Haiyaha w/ Zach (part six)

(Pics taken 9/13/14)

Beautiful sunny / cool day in Rocky Mountain Nat’l park. Visiting Lake Haiyaha and Chaos Creek

RMNP - Emerald Lake / Glacier Gorge Trail to Lake Haiyaha w/ Zach (part five)

(Pics taken 9/13/14)

Beautiful sunny / cool day in Rocky Mountain Nat’l park. Visiting Lake Haiyaha and Chaos Creek

RMNP - Emerald Lake / Glacier Gorge Trail to Lake Haiyaha w/ Zach (part four)

(Pics taken 9/13/14)

Beautiful sunny / cool day in Rocky Mountain Nat’l park. Visiting Lake Haiyaha and Chaos Creek