太陽系（たいようけい、taiyoukeい）
- solar system

太陽系 (たいようけい) means "solar system" in English. It refers to the sun and all the celestial objects that are gravitationally bound to it, including planets, dwarf planets, moons, asteroids, comets, and other space debris. The 太陽系 consists of the sun at the center and everything that orbits it.

⚫︎ 私達の太陽系には、八つの惑星があります。 Translation: There are eight planets in our solar system. ⚫︎ 太陽系の惑星の中で、地球は生命がいる唯一の場所です。 Translation: Among the planets in the solar system, Earth is the only place with life. ⚫︎ 太陽系の外にある星系を研究するのは難しいです。 Translation: It's difficult to study star systems outside the solar system.

You can use 太陽系 in any context where you're discussing the solar system, planets, or space exploration related to our solar system. It is a common term used in science classes, general conversations, and media related to astronomy.

太陽系 is typically written with kanji and hiragana. ・Kanji: 太陽系 ・Reading (Hiragana): たいようけい There are no other common ways to write this word. The okurigana is standard.

There are no direct synonyms for 太陽系. The term always refers to the specific system of the sun and its gravitationally bound objects. You might use phrases that describe a "solar system" to explain what it is, however.

There aren't direct antonyms for 太陽系. However, the term "星系" (せいけい, star system) is a broader term that encompasses all star systems, not just our own. Therefore you could say something like, "The 太陽系 is one 星系"

太陽系の惑星は、太陽の周りを公転しています。 ・Translation: The planets in the solar system revolve around the sun. ・Explanation: This sentence explains the movement of the planets in the solar system around the sun, using the word 太陽系.

太陽系の探査は、人類の宇宙に対する知識を深めています。 ・Translation: Exploring the solar system deepens humanity's knowledge of the universe. ・Explanation: This sentence describes the benefits of space exploration and its contribution to our understanding of the universe, with the topic of the exploration being the 太陽系.

The word 太陽系 is formed from two parts: ・太陽 (たいよう) - "sun" ・系 (けい) - "system" or "series" Therefore, 太陽系 literally means "sun system" or "solar system".