Yesterday we looked at parallax, and it's ability to help us to measure distances up to about 80 light years away. We we go further away, we need to look for new tools to help us measure the distances. These tools are called Red Shift, Luminosity, and Cepheid variables.
The video below talks about brightness and luminosity in the stellar world. If we have brightness, or luminosity, measured, we can work backwards to find distance. Of course, we have a new wrinkle to work out--what stage of life is the star in, anyway?
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment