ぼく達 宇宙に興味あるから、夜はいつも ☆お星様を眺めているんだよ!!
・ ・ ・ 初めての鳥系、雪だるまキャラ登場です。 このスズメ の特徴は、ほっぺが いろんなカラーです。
■恒星と惑星 の違い
恒星 ・ ・ ・ 自ら光る星で、内部から大量に熱を発生させているもの。以下、星 と呼ぶ。
惑星 ・ ・ ・ 太陽など他の星の光を、反射させて見えているもの。
■等級 ・ ・ ・ 星の明るさ
古代ギリシャのヒッパルコスが、明るく目立つ星を選び1等星とし、肉眼でぎりぎり見える
星を6等星と決めました。( ⇒ 実視等級 )
1等星は 6等星の100倍の明るさ、つまり、100倍のエネルギーを出しています。
一つ等級が上がると、大体2.5倍のエネルギーを出していることになります。
1等星より明るい星は、0等星、-1等星といいます。
そして、6等星より暗い星は7等星、8等星というように決められています。
※星座 と呼ばれているものは、銀河系の中のものです。
( 赤い星は温度が低く、青(白)い星は温度が高い と考えることができます。)
■絶対等級 ・ ・ ・ 各星々は、地球からの距離が違うので、天文学では星の明るさを比較を
可能にするために、32.6光年離れた位置に置いた時の星の明るさを基準としています。
☆ 星 の 誕 生
ビッグバンが起きた時にできた物資が、水素とヘリウムでした。今でも宇宙に存在する元素の1位と2位を占め、この水素やヘリウムを材料にして、今でも星は生まれています。
星雲の中でも特に密度が高く温度が低いところ(星間分子雲)と呼ばれ、それが星が生まれる場所なのです。
特に密度の高い部分では、自らの重力で収縮を始め、やがて星間分子雲は円盤状の形になり、ガスやチリが中心に向かって引き寄せられます。そして、中心部に 原始星 と言われる、星の種ができ[ 星の赤ちゃん誕生 ]です。
星間分子雲には星の材料がたくさんあるので、《 次々と 星が生まれています 》。
生まれたての星は、数百度程度で温度が低い。( 太陽の表面温度は、約6000度。)
太陽の場合、星間分子雲から原始星になるまでには、数十万年の時間がかかると考えられています。
■2人とも雪だるま王国キャラで、幼なじみです。
右のチッチは、小さい頃から宇宙飛行士になるのが夢です。そうか、な~るほど。
しみじみ語るチッチであった。雪だるま王国大学 宇宙大好天文学科卒業。
☆ みなさんも、たまには星でも眺めてみてはいかがですか?
天文台へ行くのもいいですね。
← ランキング 応援クリックをしてください。
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