Search found 2 matches
- Tue Feb 16, 2010 4:34 pm
- Forum: The Library: Information Desk and Educational Resources
- Topic: How fast is the accelerating expansion rate?
- Replies: 10
- Views: 2317
Re: How fast is the accelerating expansion rate?
Google "Hubble Constant" and see if that helps.
- Tue Feb 16, 2010 4:17 pm
- Forum: The Library: Information Desk and Educational Resources
- Topic: Parsec
- Replies: 4
- Views: 1590
Parsec
I'm having trouble defining the term "parsec". I've seen two definitions: 1. The distance at which one astronomical unit subtends one second of arc. 2. The distance at which one "solar parallax" subtends one second of arc. A "solar parallax" (as I understand it) is the ...