On hearing the word sky, a blue sheet appears in front of the eyes. But have you ever wondered why the sky is blue? And when ...

Why is the sky blue in colour? The colour of the sky is largely ... all the colours stay together and we see the sun as a bright, white light from a spacecraft or the Moon. When we look away ...

Catch two transits of Io, spot sparkling star clusters, and view Mars at aphelion while the April Full Moon lights the sky ...

filming as the colour changes from blue to black. The balloon also collects data concerning atmospheric pressure and temperature. Greg then demonstrates that the graphs for sky colour and ...