Galactic nebulas are masses of diffuse material within our galaxy . 銀河星云是我們星系中的一團團彌散物。
Astronomers usually assume that interstellar dust is closely confined to the galactic plane . 天文學家通常認為,恒星際星塵都是緊靠著銀河平面的。
At the sides of the well the magnetic field lines are quite high and rise steeply above the galactic plane . 在井的四邊,磁力線相當高,并急劇地升到銀道面以上。
At the current epoch in galactic history, star formation appears to take place in dark-cloud complexes . 在星系發展的現階段,恒星的形成看來是在暗云復合體內進行的。
The star to be moving rapidly, perhaps in an orbit around the densely concentrated stars of the galactic nucleus . 這顆星看來正在以高速運動著,其運動軌道大概就圍繞著由高度密集的恒星所構成的銀河系核心。
The galactic center is a rich and complex source of infrared radiation in which interesting phenomena occur in great variety . 銀河系中心是一個紅外輻射豐富和結構復雜的源,在那里發生著各種各樣的有趣現象。
Some celestial bodies similar to galactic nebulas but without any luminosity sometimes reveal their presence as dark patches obscuring the light of stars beyond them . 某些與銀河星云相似但不發光的天體,有時看來象塊黑色補丁,遮住了周圍的星光。