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Machine washable and made from 100% cotton
For most of its history
a Cretaceous formation in central-western Queensland
In Search of Ancient Queensland takes readers on a journey through deep time
not only to our earliest lifeforms
Handheld sky-quality meter The natural world Machine washable and made fromAn affordable meter for measuring sky brightness for astronomers! The sky quality meter measures the brightness of the night sky in magnitudes per square arcsecond. Unprecedented sensitivity in a handheld meter! Uses Find out how good the night or site REALLY is. Compare the sky brightness at different sites quantitatively. Document the evolution of light pollution in your area. Set planetarium dome illumination to mimic the skies people are likely to