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a region beyond Neptune in the solar system containing icy objects like dwarf planets, asteroids, and comets
カイパーベルト, カイパー帯
a highly energetic celestial object emitting powerful radiation from the center of a galaxy, often associated with a supermassive black hole
クエーサー, 準星
a distant, hypothetical region surrounding the solar system, thought to harbor icy bodies and comets
オールトの雲, オールト雲
the outer layer of the Sun's atmosphere, observable as a plasma halo during a solar eclipse
コロナ, 外気冠（がいきかん）
the apparent path that the Sun traces in the sky over the course of a year, which is also the plane of the Earth's orbit around the Sun
黄道 (こうどう), エクリプティック
the apparent displacement or difference in the apparent position of an object when viewed along two different lines of sight, often used in astronomy to measure the distance of nearby stars
視差（しさ）, パララックス
a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation from its magnetic poles
パルサー, パルサー星
a unit of measurement equal to the average distance between the Earth and the Sun, approximately 149.6 million kilometers
天文単位 (てんぶんたんい), アストロノミカルユニット
a unit of astronomical distance equivalent to about 3.26 light-years
パーセク, パーセク距離
a high-energy particle, mainly originating from outside the Solar System, that travels through space at nearly the speed of light
宇宙線 (うちゅうせん), コズミックレイ
(cosmology) the faint glow of radiation spreading through the universe, believed to be residual radiation from the Big Bang
宇宙マイクロ波背景放射, コズミックマイクロ波背景
(cosmology) a theory proposing that the solar system formed from a rotating nebula of gas and dust about 4.6 billion years ago
星雲仮説, ネビュラ仮説
(cosmology) a measure of the rate at which the universe is expanding, determined from the observation of distant galaxies' recession velocities
ハッブル定数, ハッブル定数値
the matter and radiation that exists in the space between stars within a galaxy
星間媒質, 星間物質
the space surrounding the Sun dominated by solar wind
ヘリオスフィア, 太陽圏
very small particles originally derived from stars, serving as raw material for forming planets, and existing between galaxies, stars, and other celestial bodies
宇宙塵（うちゅうじん）, コズミックダスト
a small celestial body that becomes visible as a meteor upon entrance into the atmosphere of the earth
隕石（いんせき）, 小惑星（しょうわくせい）
(cosmology) the rapid expansion of the universe following the Big Bang
インフレーション, インフレーション理論
a disruption in earth's magnetic field caused by solar activity, resulting in variations that can impact electronic systems and communications on earth
磁気嵐, 地磁気嵐
the colored lights, mainly green and red, in the sky seen primarily near the southern magnetic pole
オーロラオーストラリス, 南極光
the colored lights, mainly green and red, in the sky seen primarily near the northern magnetic pole
オーロラ, 極光
associated with the phenomena, processes, or theories related to the origin and formation of the universe or celestial bodies
宇宙創成の, コスモゴニック
study of celestial objects outside the Milky Way galaxy
銀河外天文学, 銀河系外天文学
relating to or resembling a nebula, which is a cloud of gas and dust in outer space
星雲の, 霧状の
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