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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

   The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy. Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and ...

3. In Depth | Jupiter – NASA Solar System Exploration

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

   In fact, Jupiter has the same ingredients as a star, but it did not grow massive enough to ignite. About 4 billion years ago, Jupiter settled into its current position in the outer solar system, where it is the fifth planet from the Sun.

4. 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.

5. Planet Compare - NASA Solar System Exploration

   solarsystem.nasa.gov/planet-compare

   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 | Saturn – NASA Solar System Exploration

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

   About 4 billion years ago, Saturn settled into its current position in the outer solar system, where it is the sixth planet from the Sun. Like Jupiter, Saturn is mostly made of hydrogen and helium, the same two main components that make up the Sun.

7. In Depth | Moons – NASA Solar System Exploration

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

   In the outer solar system, the gas giants Jupiter and Saturn and the ice giants Uranus and Neptune have dozens of moons. As these planets grew in the early solar system, they were able to capture smaller objects with their large gravitational fields.

8. In Depth | Mars – NASA Solar System Exploration

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

   Mars is one of the easiest planets to spot in the night sky – it looks like a bright red point of light. Despite being inhospitable to humans, robotic explorers – like NASA's new Perseverance rover – are serving as pathfinders to eventually get humans to the surface of the Red Planet.

9. Overview | Mars – NASA Solar System Exploration

   solarsystem.nasa.gov/planets/mars/overview.amp

   Mars is one of the most explored bodies in our solar system, and it's the only planet where we've sent rovers to roam the alien landscape. NASA currently has two rovers (Curiosity and Perseverance), one lander (InSight), and one helicopter (Ingenuity) exploring the surface of Mars.

10. 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.

11. 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.