Space Flashcards
What are some features of the expanding universe?
More distant galaxies are moving away at a greater velocity
The size of galaxies doesn’t change
What is Olber’s paradox?
Olber’s paradox states that if the universe is non-expanding, the night sky would not be dark.
How does Olber’s paradox support the concept of the expanding universe?
Many celestial objects are moving away from observers on Earth therfore the light from these is redshifted to Infrared light, which is undetectable to the naked eye.
Also some light has yet to reach us.
What is some evidence for the expansion of the universe?
Olber’s paradox
Cosmic microwave background radiation
Hubble’s law
What can you say about the light emmited from stars that are on the hotter side?
They have a shorter peak wavelength.
They emit more radiation per unit surface area at all wavelengths than cooler objects.
What is an acronym for Cosmic microwave background radiation?
Clever
Mice
Build
Radios
How does Cosmic microwave background radiation support the idea of an expanding universe?
The peak wavelength of the CMBR is a very low temperature due to the fact that the universe has been expanding, therefore cooling for a very long time.
