LIGHT IN THE SKY

What are the light bulbs of our universe?

STARS!!!!

Similarities and differences

All light comes from stars.

What are stars?

• Stars are mostly hydrogen that is reacting and making energy

All stars are organized on the HR diagram

Stars will be in different sections of

the HR diagram during their lifetimes.

Stars aren’t the same their whole lives

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.

Part 2: How stars make light

Quick write time!

Short video summary

Stars make light through a chemical reaction called

Fusion

No fusion, no light

NUCLEAR FUSION IN THE SUN:

H + H He + S U N L I G H TS U N L I G H T

In the sun, Hydrogen nuclei are squeezed together to make….

Fusion creates our different elements!

From the big bang

From H/He fusion

From supernovas

All stars are plasma, the highest energy form of matter.

Lets simulate what a star might look like

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

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.

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

So…

How do we know only stars make light?

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

SOLAR ECLIPSE:

“sun is covered”

Where is the light coming from?

THE SUN

What is blocking the sun?

THE MOON

What a solar eclipse looks like from space

On Earth On Jupiter

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

The phases of the moon

A lunar eclipse

A solar eclipse

LUNAR ECLIPSE:

“moon is covered”

Where is the light coming from?

THE SUN

What is being blocked by shadow?

THE MOON

What is blocking the light?

THE EARTH

What a lunar eclipse looks like from Earth

Which is the solar eclipse?

Solar eclipse

Lunar eclipse

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2

Now it’s time to summarize what you have learned by completing the last page

individually.