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

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

   Of the eight planets, Mercury and Venus are the only ones with no moons. The giant planets Jupiter and Saturn lead our solar system’s moon counts. In some ways, the swarms of moons around these worlds resemble mini versions of our solar system.

3. In Depth | Sun – NASA Solar System Exploration

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

   The Sun is the largest object in our solar system. Its diameter is about 865,000 miles (1.4 million kilometers). Its gravity holds the solar system together, keeping everything from the biggest planets to the smallest bits of debris in orbit around it.

4. 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.

5. 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.

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

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

   Some astronomers argued that location (context) is important, especially in understanding the formation and evolution of the solar system. One idea is to simply define a planet as a natural object in space that is massive enough for gravity to make it approximately spherical.

7. In Depth | Jupiter – NASA Solar System Exploration

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

   Jupiter is the fifth planet from our Sun and is, by far, the largest planet in the solar system – more than twice as massive as all the other planets combined. Jupiter's stripes and swirls are actually cold, windy clouds of ammonia and water, floating in an atmosphere of hydrogen and helium.

8. The Solar System and Beyond is Awash in Water

   solarsystem.nasa.gov/news/12795

   Understanding the distribution of water in our solar system tells us a great deal about how the planets, moons, comets and other bodies formed 4.5 billion years ago from the disk of gas and dust that surrounded our sun.

9. In Depth | Pluto – NASA Solar System Exploration

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

   Dwarf planet Pluto is a member of a group of objects that orbit in a disc-like zone beyond the orbit of Neptune called the Kuiper Belt. This distant realm is populated with thousands of miniature icy worlds, which formed early in the history of our solar system about 4.5 billion years ago.

10. In Depth | Moons – NASA Solar System Exploration

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

    There are hundreds of moons in our solar system – even asteroids have been found to have small companion moons. 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.

11. In Depth | Earth – NASA Solar System Exploration

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

    While Earth is only the fifth largest planet in the solar system, it is the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal.