Your Cosmic Connection to the Elements
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Transcript of Your Cosmic Connection to the Elements
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Your Cosmic Connection to the ElementsJames Lochner (USRA) & Suzanne Pleau Kinnison (AESP), NASA/GSFC
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Elementary Connections
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Cosmic Connections
To make an apple pie from scratch, you must first invent the universe.
Carl Sagan
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Your Cosmic Connection to the Elements?
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The Big Bang
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The Big Bang Cosmology
• The expansion of the universe began at a finite time in the past, in a state of enormous density, pressure and temperature.
• “Big Bang” is a highly successful family of theories with no obvious competitor.· Explains what we see, and has made several
successful predictions.
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Big Bang Nucleosynthesis
Within first three minutes, Hydrogen & Helium formed.
• At t =1 s, T=10,000,000,000 K: soup of particles: photons, electrons, positrons, protons, neutrons. Particles created & destroyed.
• At t =3 min, T=1,000,000,000 K: p+n => D
• D + D => He
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Big Bang Nucleosynthesis
Note that the only elements that come from the Big Bang are:
HydrogenHelium
Lithium (a little bit)
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Small Stars
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Stellar Nursery
Space is filled with the stuff to
make stars.
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Stars start from clouds
Clouds provide the
gas and dust from which stars form.
But not this kind of dust
Rather: Irregular Grains Of Carbon or Silicon
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Small Stars: Fusion of light elements
Fusion:(at 15 million degrees !)4 (1H) => 4He + 2 e+ + 2 neutrinos + energy
Where does the energy come from ?Mass of four 1H > Mass of one 4He
E = mc2
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Small Stars to Red Giants
After Hydrogen is exhausted in core, Energy released from nuclear fusion no longer counter-acts inward force of gravity.
• Core collapses,Kinetic energy of collapse converted into heat.This heat expands the outer layers.• Meanwhile, as core collapses, Increasing Temperature and Pressure …
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A Red Giant You Know
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Beginning of Heavier Elements
At 100 million degrees Celsius, Helium fuses:3 (4He) => 12C + energy
After Helium exhausted, small star not large enough to attain temperatures necessary to fuse Carbon.
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The end for small stars
Planetary Nebulae
After Helium exhausted, outer layers of star expelled
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Large Stars
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Heavy Elements from Large Stars
Large stars also fuse Hydrogen into Helium, and Helium into Carbon.
But their larger masses lead to higher temperatures, which allow fusion of Carbon into Magnesium, etc.
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Element Formation through Fusion
16O + 16O 32S + energy4He + 16O 20Ne + energy
Light Elements Heavy Elements
4 (1H) 4He + energy 3(4He) 12C + energy 12C + 12C 24Mg + energy4He + 12C 16O + energy28Si + 7(4He) 56Ni + energy 56Fe
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Supernova
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Supernova !
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Supernova
Fusion of Iron takes energy, rather than releases energy.
So fusion stops at Iron.Energy released from nuclear fusion no longer counter-acts
inward force of gravity.
But now there is nothing to stop gravity.
Massive star ends its life in supernova explosion.
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Supernova
Explosive power of a supernova:• Disperses elements
created in large stars.
• Creates new elements, especially those heavier than Iron.
All X-ray Energies Silicon
Calcium Iron
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From Death comes Life
Supernovae compress gas and dust which lie between the stars. This gas is also enriched by the expelled material.
This compression starts the collapse of gas and dust to form new stars.
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Cosmic Rays
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Cosmic Rays
Lithium, Beryllium, and Boron are difficult to produce in stars.
(L, Be, and B are formed in the fusion chains, but they are unstable at high temperatures, and tend to break up into residues of He, which are very stable).
So what is the origin of these rare elements? => Collisions of Cosmic Rays with Hydrogen
& Helium in interstellar space.
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Cosmic Rays Collisions with ISM
Lithium, beryllium, and boron and sub-iron enhancements attributed to nuclear
fragmentation of carbon, nitrogen, oxygen, and iron with interstellar matter (primarily hydrogen
and helium).
(CNO or Fe) + (H & He)ISM (LiBeB or sub-Fe)
Light nucleus
Light nucleus
Interstellar matter (~1 hydrogen atom per cm3)
Cosmic ray
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Cosmic Elements
White - Big Bang Pink - Cosmic RaysYellow - Small Stars Green - Large Stars
Blue - Supernovae
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Your Cosmic Connection to the Elements?
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Composition of the Universe
Actually, this is just the solar system.
Composition varies from place to place in universe, andbetween different objects.
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“Stuff of the Stars: Cosmic Connection
A classroom activity that demonstrates the different elemental compositions of different objects in the universe.· Demonstrates how we estimate the
abundances.
(Modified from Stacie Kreitman, Falls Church, VA)
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Top 10 Elements in the Human Body
Element by # atoms Cosmic Process10. Magnesium (Mg) 0.03% LS, SN 9. Chlorine (Cl) 0.04% LS 8. Sodium (Na) 0.06% LS 7. Sulfur (S) 0.06% SS, LS 6. Phosphorous (P) 0.20% LS 5. Calcium (Ca) 0.24% LS 4. Nitrogen (N) 1.48% SS, LS 3. Carbon (C) 9.99% SS, LS 2. Oxygen (O) 26.33% LS, SS 1. Hydrogen (H) 61.56% BB
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What’s Your Cosmic Connection to the Elements?
BetelgeuseRed Giant making Ca and beyond. Future supernova.
Rigel - Blue Supergiantmaking, He, C, N. Futureheavy elements.
Orion NebulaNew stars gettingheavy elements.Future Earths?
p3 steadily making He.Future C, N
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http://imagine.gsfc.nasa.gov/docs/teachers/elements/
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Spectral Analysis
We can’t always get a sample of a piece of the Universe.
So we depend on light !
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Spectral Analysis
Each element has a unique spectral signature:
• Determined by arrangement of electrons. • Lines of emission or absorption arise from
re-arrangement of electrons into different energy levels.
Hydrogen
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Nickel-odeon Classroom Activity
Spread a rainbow of color across a piano keyboard(Developed by Shirley Burris, Nova Scotia)
Then, “play” an element
Hydrogen
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More Musical Elements
Now play another elementHelium
CarbonAnd Another
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Getting a Handle on Water
Oxygen
All together now ...
Hydrogen
Water
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http://imagine.gsfc.nasa.gov/docs/teachers/elements/