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2. In Depth | Earth – NASA Solar System Exploration

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

   With a radius of 3,959 miles (6,371 kilometers), Earth is the biggest of the terrestrial planets and the fifth largest planet overall.

3. What is a Planet? | Planets – NASA Solar System Exploration

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

   A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.

4. In Depth | Our Solar System – NASA Solar System Exploration

   solarsystem.nasa.gov/solar-system/our-solar-system/in-depth.amp

   For this reason, the first four planets – Mercury, Venus, Earth, and Mars – are terrestrial planets. They are all small with solid, rocky surfaces. Meanwhile, materials we are used to seeing as ice, liquid, or gas settled in the outer regions of the young solar system.

5. Planet Compare - NASA Solar System Exploration

   solarsystem.nasa.gov/planet-compare

   NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

6. In Depth | Venus – NASA Solar System Exploration

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

   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 | Mercury – NASA Solar System Exploration

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

   The smallest planet in our solar system and nearest to the Sun, Mercury is only slightly larger than Earth's Moon. From the surface of Mercury, the Sun would appear more than three times as large as it does when viewed from Earth, and the sunlight would be as much as seven times brighter.

8. In Depth | Mars – NASA Solar System Exploration

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

   When the solar system settled into its current layout about 4.5 billion years ago, Mars formed when gravity pulled swirling gas and dust in to become the fourth planet from the Sun. Mars is about half the size of Earth, and like its fellow terrestrial planets, it has a central core, a rocky mantle, and a solid crust.

9. In Depth | Neptune – NASA Solar System Exploration

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

   Dark, cold, and whipped by supersonic winds, ice giant Neptune is the eighth and most distant planet in our solar system. More than 30 times as far from the Sun as Earth, Neptune is the only planet in our solar system not visible to the naked eye.

10. 10 Need-to-Know Things About Mercury - NASA Solar System...

    solarsystem.nasa.gov/module/88

    Mercury is a rocky planet, also known as a terrestrial planet. Mercury has a solid, cratered surface, much like the Earth's moon.

11. In Depth | Moons – NASA Solar System Exploration

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

    Of the terrestrial (rocky) planets of the inner solar system, neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons. In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons.