O | 化學工廠資訊網
![O](https://i.imgur.com/lO00bdM.jpg)
Starsofthistypeareveryrare,butbecausetheyareverybright,theycanbeseenatgreatdistancesandfourofthe90brighteststarsasseenfromEarth ...
![O](https://i.imgur.com/lO00bdM.jpg)
Stellar classification
Relative size of O-type stars with other main-sequence starsAn O-type star is a hot, blue-white star of spectral type O in the Yerkes classification system employed by astronomers. They have temperatures in excess of 30,000 kelvins (K). Stars of this type have strong absorption lines of ionised helium, strong lines of other ionised elements, and hydrogen and neutral helium lines weaker than spectral type B.
Stars of this type are very rare, but because they are very bright, they can be seen at great distances; out of the 90 brightest stars as seen from Earth, 4 are type O.[a] Due to their high mass, O-type stars end their lives rather quickly in violent supernova explosions, resulting in black holes or neutron stars. Most of these stars are young massive main sequence, giant, or supergiant stars, but also so...
光棧 O`star LED | 化學工廠資訊網
創業O'STAR | 化學工廠資訊網
Ostar 酯類油品 | 化學工廠資訊網
Ostar Nails | 化學工廠資訊網
O | 化學工廠資訊網
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O'star 酯類潤滑油 | 化學工廠資訊網
ostar - 優惠推薦 | 化學工廠資訊網
![](https://i.imgur.com/lO00bdM.jpg)
【新北市】宏洋高分子化學有限公司
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