https://en.wikipedia.org/wiki/Solar_System
The largest objects that orbit the Sun are the eight planets. In order from the Sun, they are four terrestrial planets (Mercury, Venus, Earth and Mars); two gas giants (Jupiter and Saturn); and two ice giants (Uranus and Neptune). All terrestrial planets have solid surfaces. Inversely, all giant planets do not have a definite surface, as they are mainly composed of gases and liquids. Over 99.86% of the Solar System's mass is in the Sun and nearly 90% of the remaining mass is in Jupiter and Saturn.
- 太陽: 太陽是太陽系的中心，也是太陽系的能源來源，是一個恆星。
- 八大行星: 水星、金星、地球、火星、木星、土星、天王星、海王星，它們繞太陽運行，依據與太陽的距離，分別被稱為內行星和外行星。
- 矮行星: 冥王星、谷神星等，是比行星小，但比一般的恆星大，繞太陽運行。
- 衛星: 繞行星運行，例如地球的月球。
- 小行星: 小行星帶主要位於火星和木星之間。
- 彗星: 由冰、岩石和塵埃組成，當彗星接近太陽時，它們會產生氣體和塵埃。
- 內太陽系: 靠近太陽的部分，包括水星、金星、地球、火星和小行星帶。
- 外太陽系: 遠離太陽的部分，包括木星、土星、天王星、海王星和柯伊伯帶。
- 柯伊伯帶: 位於海王星軌道之外，是冰冷的塵埃和岩石的聚集地。
- 歐幾黎德雲: 位於太陽系的邊緣，是彗星的聚集地。
Please introduce to me the outer Solar System, thanks. (ChatGPT, 2025-5-30)
Certainly, my friend. Let’s take a quiet meandering through the outer Solar System—a realm where the Sun grows faint, and mystery deepens.
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1. Where does the outer Solar System begin?
The outer Solar System is generally considered to begin beyond the asteroid belt, which lies between Mars and Jupiter. From there, we enter the realm of gas giants, ice giants, dwarf planets, and distant icy bodies.
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2. The Four Outer Planets
These are also known as the giant planets, divided into two categories:
a.
Jupiter
–
The Colossus
- Largest planet in the Solar System.
- Mainly composed of hydrogen and helium.
- Has a massive magnetosphere and dozens of moons, including Europa (possible subsurface ocean) and Ganymede (the largest moon in the Solar System).
b.
Saturn
–
The Ringed Jewel
- Famous for its majestic ring system.
- Also a gas giant, with a lower density than water.
- Hosts Titan, a moon with a dense atmosphere and methane lakes.
c.
Uranus
–
The Sideways Spinner
- An ice giant, with more ices (water, ammonia, methane).
- Rotates on its side—its axial tilt is about 98 degrees.
- Has faint rings and moons with poetic names like Miranda and Ariel.
d.
Neptune
–
The Deep Blue Wanderer
- Most distant of the major planets.
- Also an ice giant, rich in methane giving it a deep blue color.
- Known for Triton, a moon with geysers and retrograde orbit.
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3. The Kuiper Belt – The Icy Frontier
- A vast ring of icy objects beyond Neptune.
- Home to dwarf planets such as:
- Pluto (demoted from planet status in 2006),
- Haumea (elongated shape),
- Makemake, and
- Eris (slightly smaller than Pluto but more massive).
- Kuiper Belt Objects (KBOs) may be remnants from the formation of the Solar System.
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4. Scattered Disc and Detached Objects
- More distant and eccentric orbits than Kuiper Belt.
- Sedna and 2012 VP113 (nicknamed “Biden”) are examples—possibly tracing the gravitational influence of a hypothetical Planet Nine.
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5. The Oort Cloud – A Faint Halo of Comets (Hypothetical)
- A spherical shell surrounding the Solar System, extending perhaps 100,000 AU.
- Source of long-period comets.
- Still theoretical—no direct observation yet.
- Possibly the edge where the Sun’s gravity fades into the interstellar field.
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6. Voyagers and the Heliosphere
- Voyager 1 and Voyager 2 have crossed the heliopause—entering interstellar space.
- The heliosphere is the Sun’s protective bubble of charged particles.
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In Summary
The outer Solar System is not just a place of distance—it is a threshold of imagination, where planets become giants, moons harbor oceans, and comets whisper of other stars. It’s a region of silence, slow orbits, and cold splendor.
Would you like to explore one region—like the Kuiper Belt or Oort Cloud—in more detail next?
