1
Doppler effect refers to _____ objects.
2
When an object travels away from the observer the wavelength has a ____ frequency.
3
The lower the frequency the ____ the color
4
What is a redshift?
5
The higher the frequency the ___ the color
6.
What is a blueshift?
7
The observation that nearly all galaxies exhibit redshift suggests that the universe is _______.
8
Stars rely on ____ for energy
9
The Big Bang theory proposed the universe began as a ______.
10
List the 3 primary evidences to support the Big Bang
11
How do scientists measure the progress of the Big Bang?
12
About ___ of the universe is made up of dark matter
13
Scientists only know about dark matter because of its _______ effect
14
Galaxies were seeded because of structures of _________.
15
The rate of the expansion of the universe is __________.
1. moving
2. lower
3. longer
4. The shift of light towards longer wavelengths, indicating that an object is moving away from the observer.
5. shorter
6. The shift of light towards shorter wavelengths, indicating that an object is moving towards the observer.
7. expanding
8. nuclear fusion
9. singularity
10. Cosmic microwave background radiation, abundance of light elements, and the redshift of galaxies.
11. By analyzing the redshift of galaxies and measuring the cosmic microwave background radiation.
12. 27%
13. gravitational
14. dark matter
15. accelerating