9 December

If you look up at the sky at night you can see planets, moons, stars, meteors, and so on. You can see them all ‘at the same time’. But they don’t all share the same time, some of that light you’re seeing is billions of years old, some of it may be a few minutes old, some a few hours, some a few years. The starlight you’re seeing might be from a star that blew up millions of years ago. So does that star ‘exist’, now? What does ‘now’ even mean?