Largest by Diameter:
1. Jupiter: The undisputed king of the planets in our solar system, with a diameter of 142,984 kilometers (88,846 miles). It's so large that you could fit all the other planets inside it.
2. Saturn: Another gas giant, it's the second largest planet with a diameter of 120,536 kilometers (74,898 miles).
3. Uranus: The third largest, this ice giant boasts a diameter of 51,118 kilometers (31,763 miles).
4. Neptune: The final ice giant in our solar system, with a diameter of 49,528 kilometers (30,775 miles).
5. Earth: While tiny compared to the gas giants, Earth is the largest of the terrestrial planets, with a diameter of 12,742 kilometers (7,926 miles).
Largest by Mass:
1. Jupiter: It's not just the biggest, but also the most massive planet in our solar system, with a mass 317.8 times that of Earth.
2. Saturn: The second most massive planet, with a mass 95 times that of Earth.
3. Uranus: The third most massive, with a mass 14.5 times that of Earth.
4. Neptune: The fourth most massive, with a mass 17.1 times that of Earth.
5. Earth: As the largest terrestrial planet, Earth comes in at 5th place for mass in our solar system.
Beyond our Solar System:
While we can't directly measure the diameters of exoplanets (planets outside our solar system), astronomers use various techniques to estimate their sizes. Some of the largest known exoplanets include:
* HD 100546 b: This planet, estimated to be 6 times the size of Jupiter, is a gas giant orbiting a young star.
* WASP-17b: This planet is about 2.5 times the size of Jupiter and has an extremely low density, making it one of the "puffiest" planets known.
Important Note: The study of exoplanets is still in its early stages, and we're constantly discovering new and fascinating planets that challenge our understanding of planetary formation.
