But it does tell us something important about our ever-changing view of the solar system. Here's everything you need to know about Mercury in retrograde — why it happens and what it really means ...

February brings a rare planetary parade, with five bright planets in clear view and a special alignment of Mercury and Saturn ...

Stargazers will be treated to a rare alignment of seven planets on 28 February when Mercury joins six other planets that are already visible in the night sky. Here's why it matters to scientists.

Despite Mercury being the closest planet to the Sun, the pictured craters are some of the coldest places in the solar system ... Agency's tethered satellite project that flew on the US space ...

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – here’s how to spot the celestial show ...