The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Earth's mesmerizing northern and southern lights — the auroras — have captivated humans for millennia. But our planet isn't the only world that hosts these ethereal displays. Since the 1970s ...

The Very Large Telescope (VLT) has caught the first-ever direct photograph of a solar system that looks very much like our own — only much younger. Nearly 300 light-years away, it has a Sun-like ...