it happens that what we've done is we've taken it and hung it on the starlight, the magic of starlight — how wonderful it is, how much you can tell from just looking at a star through a telescope and measuring the light that comes out of it, and this takes us into realms of why a star shines; what do you mean by time when you go back millions of years into the universe lifetime; what do you mean, why do stars shine with different colours.