See five planets align in order for the first time in 18 YEARS: Mercury, Venus, Mars, Jupiter and Saturn will appear in formation in the dawn sky this week in rare 'planet parade' ...

Researcher Alexander Mustill from Lund University, Sweden , said the new planet may have come from outside the Solar System, and so could be an exoplanet. His hypothesis is that around 4.5 billion ...

All the planets have now been joined by a half-moon as part of a line-up that has not been seen for 18 years. It is not uncommon to see two or three planets close together, but this is the first ...

A cloud of collapsing gas created our Sun, the first thing to form in our solar system. This happened about . Then the planets began to emerge, as the billions of particles of gas and dust left ...