Post on 16-Nov-2021
8.8A describe components of the universe, including stars, nebulae, galaxies and use models such as HR diagrams for classification
8.8C explore how different wavelengths of the electromagnetic spectrum such as light and radio waves are used to gain information about distances and properties of the universe.
What are Waves?
Waves
Be sure to make a key for the colors!
My key:Blue -radioGreen – microRed – infraredVisible - orangeUV - purpleX-ray – greyGamma - yellow
frequencywavelength
Microwaves
(which box do we put it in?)
Everyday Use:
Circle - red
Be ready to write down the number of the next slide, it would be good to print in color at home!
X-Ray Ultraviolet Visible Infrared Radio
The Electromagnetic Spectrum and the Universe
Infrared Universe Exploring the Infrared Universe
The Beautiful Universe
Exploring the Universe through Gamma Rays
Spectral Analysis
We can’t always get a sample of a piece of the Universe.
So we depend on light !
Hydrogen
The horizontal axis shows the star’s surface temperature, the axis is reversed from the way you normally see it, it decreases from left to right
The sun is in the middle of this diagram. It is used for comparison
Gravity causes the last of the star’s matter to collapse inward and compact
It is now a white dwarf (facts below)
The star’s matter is extremely dense
White dwarfs are the size of Earth, but have the mass of the Sun
Once all the energy is gone, they no longer emit light
The star is dead and is now a black dwarf
Supernova
The energy is eventually released in a powerful explosion called a supernovaThe temperature of a supernova can reach 1,000,000,000 °C