Sadr vs P Cygni
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Sadr
Sadr is the proper name of Gamma Cygni, a bright F8 Iab supergiant in the constellation Cygnus. It lies at the center of the Northern Cross, an asterism formed by several prominent stars, and appears against dense Milky Way star fields near the Gamma Cygni nebula. Distance estimates place Sadr at roughly 1,800 light-years from Earth, while the surrounding nebular structures may not be at exactly t...
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P Cygni
P Cygni is a luminous blue variable star in the constellation Cygnus, estimated to lie several thousand light-years from Earth. It became visible to the naked eye during outbursts around 1600 and again in the mid-17th century, establishing it as one of the earliest recognized variable stars. Its spectrum features prominent emission lines flanked by absorption troughs displaced to shorter wavelengt...
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