系外行星的兩個”第一次”重要發現

1・從1995年至2021年十月底，找到了4551顆系外行星。（系外行星係指太陽系外的行星） 2・90年代如何開始找尋太陽系以外的行星？首先被發現的系外行星。 3・內華達大學拉斯維加斯分校研究人員，長期追蹤獵戶座GW合星，近期重要發現：第一次看到一顆行星繞著3顆恆星公轉。   a.如何找到的。   b.何謂原始星盤。 4・首次在我們的銀河系外，錢卓拉X射線太空望遠鏡找到位於M51星系的行星。 5・找系外行星的幾種方法。

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