- #1
LaurieAG
- 21
- 0
I have two questions with regards to galactic rotations.
Does the concept of a Galactic/Cosmic Year also apply to other galaxies apart from the Milky Way?
Is the Galactic/Cosmic Year of other galaxies used in any analysis based on observations made of those galaxies?
http://en.wikipedia.org/wiki/Galactic_year
Does the concept of a Galactic/Cosmic Year also apply to other galaxies apart from the Milky Way?
Is the Galactic/Cosmic Year of other galaxies used in any analysis based on observations made of those galaxies?
http://en.wikipedia.org/wiki/Galactic_year
The galactic year, also known as a cosmic year, is the duration of time required for the Solar System to orbit once around the center of the Milky Way Galaxy.[1] Estimates of the length of one orbit range from 225 to 250 million "terrestrial" years.[2]
The galactic year provides a conveniently usable unit for depicting cosmic and geological time periods together. By contrast, a "billion-year" scale does not allow for useful discrimination between geologic events, and a "million-year" scale requires some rather large numbers.[3]