| 21. | Two of the world's best celestial spies have been keeping a close watch on the Crab Nebula.
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| 22. | A degree to the northwest of ? Tauri is the Crab Nebula ( M1 ), a supernova remnant.
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| 23. | The story ends with the revelation that, 50 years later, another message is received from the Crab Nebula.
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| 24. | :: : I will note that SN 1054, the supernova which created the Crab Nebula, was widely observed.
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| 25. | The Crab Nebula, a well-known remnant of a supernova recorded by the Chinese in 1054, also contains a pulsar.
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| 26. | Consider that the supernova that created the Crab Nebula was most likely visible during daylight hours at its peak.
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| 27. | The Crab Nebula lies roughly 1.5 degrees away from the ecliptic the plane of Earth's orbit around the Sun.
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| 28. | Supernova remnants, on the other hand, like the Crab Nebula, are characterized as nonthermal emission ( synchrotron radiation ).
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| 29. | On July 4, 1054, Chinese astronomers observed a " guest star ", the supernova now called the Crab Nebula.
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| 30. | His astronomical translations were useful in associating the Crab Nebula with a supernova observed by the Chinese in 1054.
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