(Ionized+ gas = Plasma)
GOOD AFTERNOON!
ANNOUNCEMENTS
TODAY WE WILL
Today is…
- Warm-Up
- Life Cycle of a Star Notes
Wednesday October 15th
DO THIS FIRST:
DID YOU KNOW…?
What is a star? A star is a ___________________.
©MrsReaderPants 2023
Distance to Stars - Light Years
Because stars are so far away, astronomers must measure their distance in a very large unit called a Light Year.
- A light year is the distance light travels in one year .
- The abbreviation for a light year is ly
- 1 ly = 9.5 X 1012 km or 9.5 trillion km or 5.8 trillion miles.
- Proxima Centauri, the next closest star is 4.3 light years from the Sun.
(about 25 trillion miles away!)
light speed simulator
Absolute brightness is also called Luminosity
GOOD AFTERNOON!
ANNOUNCEMENTS
TODAY WE WILL
Today is…
February the 27th
DO THIS FIRST:
DID YOU KNOW…?
What is an HR Diagram?
©MrsReaderPants 2023
Warm Up: Thursday 2/27
What does this diagram represent?
- What do each axis represent?
GOOD AFTERNOON!
ANNOUNCEMENTS
TODAY WE WILL
Today is…
- Warm-Up
- Finish Life Cycle of a Star Notes
- Start Star Spectroscopy Lab
Monday, October the 14th
Warm-Up Question:
On next slide →
DID YOU KNOW…?
Warm Up: Monday 10/14
What does this diagram represent?
- What do each axis represent?
Finish Notes
Life Cycle of Stars 2.0 - Luchs
Jia Luchs
Created on October 15, 2025
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Transcript
(Ionized+ gas = Plasma)
GOOD AFTERNOON!
ANNOUNCEMENTS
TODAY WE WILL
Today is…
Wednesday October 15th
DO THIS FIRST:
DID YOU KNOW…?
What is a star? A star is a ___________________.
©MrsReaderPants 2023
Distance to Stars - Light Years
Because stars are so far away, astronomers must measure their distance in a very large unit called a Light Year.
Absolute brightness is also called Luminosity
GOOD AFTERNOON!
ANNOUNCEMENTS
TODAY WE WILL
Today is…
February the 27th
DO THIS FIRST:
DID YOU KNOW…?
What is an HR Diagram?
©MrsReaderPants 2023
Warm Up: Thursday 2/27
What does this diagram represent?
GOOD AFTERNOON!
ANNOUNCEMENTS
TODAY WE WILL
Today is…
Monday, October the 14th
Warm-Up Question:
On next slide →
DID YOU KNOW…?
Warm Up: Monday 10/14
What does this diagram represent?
Finish Notes