Galactic X-ray - ginga x-ray (English spelling)

Japanese: 銀河X線 - ぎんがエックスせん(英語表記)galactic X‐ray
Galactic X-ray - ginga x-ray (English spelling)
In 1962-63, it was discovered that strong X-rays are emitted from celestial bodies. Because X-rays are absorbed by the layers of air, they were first observed by rockets, later by balloons, and then by artificial satellites. Sources of X-rays are not only in our galaxy (the Milky Way), but also outside our galaxy, in distant galaxies, and in quasars near the edge of the universe, but most of the X-rays observed come from our galaxy. These galactic X-ray sources are classified as follows:

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
1962年から63年にかけて天体から強いX線が放射されることが発見された。X線は空気の層に吸収されるので,これは初めはロケット,後には気球,さらに人工衛星によって観測されたものである。X線の源はわれわれの銀河系(天の川)のみならず銀河系の外,遠い外の銀河系,宇宙の果てに近いクエーサーなどにもあるが,観測されるX線のほとんどはわれわれの銀河系からくるものである。この銀河X線源は次のように分類されている。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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