PARIS (AFP) – European astrophysicists said on Wednesday they could settle a mystery about how galaxies crank up in size, developing from proto-structures in the early Universe to the billion-star behemoths of today. Analysis of ancient light, known as redshift, indicates that the first galaxies were formed nearly 13 billion years ago, about a billion years after the "Big Bang" that created the Universe. They then dramatically fattened up to become the giant systems we see today, and the question is why. Until now, many experts believed that galaxies increased in size by colliding with others, in the same way...