LIGHT IN THE SKY. What are the light bulbs of our universe?
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Transcript of LIGHT IN THE SKY. What are the light bulbs of our universe?
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LIGHT IN THE SKY
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What are the light bulbs of our universe?
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STARS!!!!
Similarities and differences
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All light comes from stars.
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What are stars?
• Stars are mostly hydrogen that is reacting and making energy
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All stars are organized on the HR diagram
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Stars will be in different sections of
the HR diagram during their lifetimes.
Stars aren’t the same their whole lives
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Just like the periodic table, if you know how to read it you know a lot about a star based on where it
is on the HR diagram.
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Part 2: How stars make light
Quick write time!
Short video summary
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Stars make light through a chemical reaction called
Fusion
No fusion, no light
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NUCLEAR FUSION IN THE SUN:
H + H He + S U N L I G H TS U N L I G H T
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In the sun, Hydrogen nuclei are squeezed together to make….
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Fusion creates our different elements!
From the big bang
From H/He fusion
From supernovas
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All stars are plasma, the highest energy form of matter.
Lets simulate what a star might look like
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What color is neon?
What color is hydrogen?
What color is xenon?
What color is helium?
What color is nitrogen (light bulb)?
What gases do you think are in the plasma ball?
The tesla coil works by increasing the volts (ability to push and pull electrons)
orange
pink
purple
orange
purple
Hydrogen, nitrogen, xenon
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Why do the light bulbs light up when touched by the tesla coil?
The tesla coil transforms the gas into plasma! Plasma is the 4th state of matter when electrons are VERY excited (ionized). After the big bang, only plasma existed.
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What are some applications of plasmas here on Earth? (pictures)• High efficiency lighting
• High density microcircuits
• Coating for medical implants and recording media
• Plasma electronics (tvs)
• Superconducting magnetic research
• Learning about space science
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So…
How do we know only stars make light?
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1. Only stars have a chemical reaction making energy.
2. Rocks and Ice don’t make light.
3. We can see shadows on other objects.
Nuclear fusion
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SOLAR ECLIPSE:
“sun is covered”
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Where is the light coming from?
THE SUN
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What is blocking the sun?
THE MOON
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What a solar eclipse looks like from space
On Earth On Jupiter
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Lets model it!
The Sun will be played by
The Earth will be played by
The Moon will be played by
the lamp
your head
the styrofoam ball
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The phases of the moon
A lunar eclipse
A solar eclipse
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LUNAR ECLIPSE:
“moon is covered”
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Where is the light coming from?
THE SUN
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What is being blocked by shadow?
THE MOON
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What is blocking the light?
THE EARTH
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What a lunar eclipse looks like from Earth
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Which is the solar eclipse?
Solar eclipse
Lunar eclipse
1
2
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Now it’s time to summarize what you have learned by completing the last page
individually.