100 Hours of Astronomy logos

Logos for 100 Hours of Astronomy, a project for the International Year of Astronomy 2009.

This logo is not available for sale.

Usage advice:
The logo should never be used on a background with the same colour.
The contrast between the logo and the background should always be superior to 50%.
The logo proportions should not be changed.
The elements that compose the logo should not be removed and the colours should not be altered