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...cast doubt on the comet idea, so it can’t be considered to be settled just yet. Another mysterious signal is that from Tabby’s star, which displays strange quasi-periodic dips in its brightness. Could this be evidence of orbiting alien megastructures, or is it merely a cloud of natural debris surrounding the star? Once again, the jury is still out on that one, but we...

...sand grain on a beach?' and 'How can solid rocks bend into huge folds, or flow like a liquid over geological time?' Minerals and rocks are also, of course, natural resources that provide the inorganic raw materials for almost everything humans use. A good scientific understanding of their origins, occurrence and properties helps to maximise their potential benefits to...