Science Fair Project Encyclopedia
Exametre
An exametre (American spelling: exameter, symbol: Em) is a unit of length equal to 1018 metres.
Exametres could be used for measuring interstellar distances, but astronomers have been long accustomed to use light-years and parsecs instead.
- 1 Em is equal to 105.7 light-years or 32.41 parsecs
- the distance to Betelgeuse is 4 Em
- the distance to the center of our Galaxy is 265 Em
- light travels the distance of 1 Em in 105.7 years
petametre << exametre << zettametre
See also
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details