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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

   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 meteoroids.

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 | 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.

5. 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.

6. In Depth | Pluto – NASA Solar System Exploration

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

   Discovered in 1930, Pluto was long considered our solar system's ninth planet. But after the discovery of similar intriguing worlds deeper in the distant Kuiper Belt, icy Pluto was reclassified as a dwarf planet.

7. 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.

8. 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.

9. 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.

10. Asteroids, Comets & Meteors - NASA Solar System Exploration

    solarsystem.nasa.gov/asteroids-comets-and-meteors/overview.amp

    Our solar system’s small bodies – asteroids, comets, and meteors – pack big surprises. These chunks of rock, ice, and metal are leftovers from the formation of our solar system 4.6 billion years ago. They are a lot like a fossil record of our early solar system.

11. 10 Things to Expect in Planetary Science for 2021 - NASA Solar...

    solarsystem.nasa.gov/news/1652

    New missions and new milestones are on the calendar for 2021. Here are some of the things to watch for in planetary science, as we continue to explore and learn about our incredible solar system.