A new study shows that planets like Earth could be rare if they depend on asteroid belts of a specific mass range. Researchers suggested that the size and location of a solar system’s asteroid belt could determine whether complex life …

How big is our solar system? The short answer is it’s really, really big. The more technical answer is that it’s at least 50,000 Astronomical Units, or 7.4799 × 10^12 kilometers, or not quite a light-year to the Oort cloud …