The Moon is a great place to study impact craters as there is no weather to erode them, leaving them preserved for millions of years. The Linné Crater is also relatively young and this means it has not been damaged by further impacts.
Before life emerged, Earth’s surface was as cratered as the Moon’s. Today, however, our atmosphere, liquid water and tectonic activity have all eroded and reshaped the surface. For hundreds of millions of years the Spider Crater in Western Australia has been worn away except for the harder leg-like layers made of sandstone.
Happy Little Crater
Smiling away on Mercury is the Happy Little Crater, so-called because the central mounds of this complex feature uncannily resemble a smiley face. It has a diameter of 37 kilometres (23 miles).
One of the biggest asteroids in the Asteroid Belt, Vesta carries many impact formations including three craters – Marcia, Calpurnia and Minucia – which together look a bit like a snowman. For some reason, Vesta’s northern half is more heavily cratered than the southern half.