02.12 - 전문가 대화: 태양의 자매별은 어디에? (Where are the Sun's siblings?)

02.12 - 전문가 대화: 태양의 자매별은 어디에?(Where are the Sun's siblings?) [커세라 강의 페이지]



One of the outcomes of our thinking about the sun growing up or being born in a neighborhood and then growing up with a bunch of other stars is that we actually have stellar siblings. Those stellar siblings have left the nest, this cluster in which we formed and have gone out, and we think that right now we have stellar siblings that are spread throughout the galaxy.

The stars that are formed in clusters ultimately dissolve into the background of stars within the galaxy. But if we look out, we can actually see individual stars out there that have basically the same pattern of chemical enrichment as the sun, and we think that those were the stars that we were formed with.

We can never know because we'd have to unwind billions of years of going around the center of the galaxy and map it back and make sure we're at the same place, and that's something we really can't understand from the dynamics of the stars around us. But the signature does point to every now and then we can look out and we pass one of the siblings stars near which we were born.

먼지구름(그래봐야 입방 미터당 먼지 분자 십여개)에서 별이 태어난다. 거대한 규모의 먼지 구름에서 태양만 생성 되었을까? 관측에 의하면 은하계 별중 절반이상이 동반성을 가지고 있다. 그렇다면 태양은? 태양은 동반성이 발견되지 않았다. 태양은 특별한 존재인가? 그럴리가!

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