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2. In Depth | Earth – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/earth/in-depth.amp

   Earth is composed of four main layers, starting with an inner core at the planet's center, enveloped by the outer core, mantle, and crust. The inner core is a solid sphere made of iron and nickel metals about 759 miles (1,221 kilometers) in radius.

3. In Depth | Earth's Moon – NASA Solar System Exploration

   solarsystem.nasa.gov/moons/earths-moon/in-depth.amp

   If Earth were the size of a nickel, the Moon would be about as big as a coffee bean. The Moon is an average of 238,855 miles (384,400 kilometers) away. That means 30 Earth-sized planets could fit in between Earth and the Moon.

4. In Depth | Jupiter – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/jupiter/in-depth.amp

   With a radius of 43,440.7 miles (69,911 kilometers), Jupiter is 11 times wider than Earth. If Earth were the size of a nickel, Jupiter would be about as big as a basketball. From an average distance of 484 million miles (778 million kilometers), Jupiter is 5.2 astronomical units away from the Sun.

5. In Depth | Mars – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/mars/in-depth.amp

   Interestingly, while Mars is about half the diameter of Earth, its surface has nearly the same area as Earth’s dry land. Its volcanoes, impact craters, crustal movement, and atmospheric conditions such as dust storms have altered the landscape of Mars over many years, creating some of the solar system's most interesting topographical features.

6. In Depth | Venus – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/venus/in-depth.amp

   Size and Distance. Our nearness to Venus is a matter of perspective. The planet is nearly as big around as Earth – 7,521 miles (12,104 kilometers) across, versus 7,926 miles (12,756 kilometers) for Earth. From Earth, Venus is the brightest object in the night sky after our own Moon.

7. In Depth | Pluto – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/dwarf-planets/pluto/in-depth.amp

   Pluto is about two-thirds the diameter of Earth's Moon and probably has a rocky core surrounded by a mantle of water ice. Interesting ices like methane and nitrogen frost coat the surface. Due to its lower density, Pluto's mass is about one-sixth that of Earth's Moon.

8. In Depth | Uranus – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/uranus/in-depth.amp

   Uranus is slightly larger in diameter than its neighbor Neptune, yet smaller in mass. It is the second least dense planet; Saturn is the least dense of all. Uranus gets its blue-green color from methane gas in the atmosphere.

9. In Depth | Saturn – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/saturn/in-depth.amp

   With a radius of 36,183.7 miles (58,232 kilometers), Saturn is 9 times wider than Earth. If Earth were the size of a nickel, Saturn would be about as big as a volleyball. From an average distance of 886 million miles (1.4 billion kilometers), Saturn is 9.5 astronomical units away from the Sun.

10. 10 Need-to-Know Things About Io - NASA Solar System Exploration

    solarsystem.nasa.gov/module/97

    Io is only slightly larger than Earth’s moon and about one-quarter the diameter of Earth itself.

11. In Depth | Mercury – NASA Solar System Exploration

    solarsystem.nasa.gov/planets/mercury/in-depth.amp

    Very large impact basins, including Caloris (960 miles or 1,550 kilometers in diameter) and Rachmaninoff (190 miles, or 306 kilometers in diameter), were created by asteroid impacts on the planet's surface early in the solar system's history.