chapter  20
Extra-solar Planets
WithPatrick Moore
Pages 4

Our Sun is one of at least a hundred thousand million stars in our Galaxy alone, and many of these stars are of solar type. Therefore, there is every reason to assume that planetary systems are common. If our Solar System had been formed by the near-collision between the Sun and a passing star, it would certainly have been a rarity, or even unique; but this theory has long since been discarded, and there is nothing unusual about the Sun.