Director / Editor: Victor Teboul, Ph.D.

Looking inside ourselves and out at the world
Independent and neutral with regard to all political and religious orientations, Tolerance.ca® aims to promote awareness of the major democratic principles on which tolerance is based.

The sky isn't just blue – airglow makes it green, yellow and red too

By Michael J. I. Brown, Associate Professor in Astronomy, Monash University
Matthew Kenworthy, Associate professor in Astronomy, Leiden University

The sky looks blue on a sunny day – but at night we can see the faint glow of its true colour.

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