-193°C to +427°C
3,032 miles (4.979km)
Distance from the Sun:
36 million miles (58m km)
Rotation about axis:
Revolution about Sun: 88 days
Mercury is the smallest planet in the solar system and is the closest to the Sun. Its surface is covered in craters, which makes it look a lot like Earth's Moon.
Until recently it was believed that Mercury’s iron core had cooled and hardened causing the surface to wrinkle into what scientists call lobate scarps. Some of these scarps are more than a mile high and hundreds of miles long.
However, experiments tell us that a raw egg will spin slower than a hard-boiled one and scientists have used this same logic to conclude that Mercury actually still has a fluid, molten iron core.
Liquid Iron Core
• Petri dish
• Perspex stand
Ferrofluid is a magnetic liquid often found in speakers to reduce heat and as toner in laser printers.
It contains nanoscale particles of iron and when placed near a strong magnet it takes the shape of the magnetic field.
To create variation in the spiky peaks that form, the magnet was simply moved toward and away from the fluid.