In the Solar System, core size can range from about 20% (Moon) to 85% of a planet’s radius (Mercury).
Gas giants also have cores, though the composition of these are still a matter of debate and range in possible composition from traditional stony/iron, to ice or to fluid metallic hydrogen.
What is the largest solid planet in our solar system?
The smallest planet in our solar system is Mercury and the largest planet is Jupiter.
Do all planets have an iron core?
Structure. Every inner planet has a core. The cores of Mercury, Venus, and Earth are composed of iron-nickel. Mars’s core is made of liquid iron sulfide mixed with some nickel.
What planet has a diamond core?
Move over, Hope Diamond. The most famous gems on Earth have new competition in the form of a planet made largely of diamond, astronomers say. The alien planet, a so-called “super-Earth,” is called 55 Cancri e and was discovered in 2004 around a nearby star in our Milky Way galaxy.
Which planet has more gas?
Gas Giants: Facts About the Outer Planets. The planets of the solar system as depicted by a NASA computer illustration. Orbits and sizes are not shown to scale. A gas giant is a large planet composed mostly of gases, such as hydrogen and helium, with a relatively small rocky core.
Photo in the article by “Wikipedia” https://en.wikipedia.org/wiki/Saturn