Pulsars vs. Brown Dwarves & Blue Giants: A Celestial Q&A

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A pulsar is a highly magnetized rotating neutron star that emits beams of radiation, formed after a massive star undergoes a supernova. In contrast, a brown dwarf is a substellar object that is too small to sustain nuclear fusion, often considered a "failed star." Brown dwarfs are not dead white dwarfs; they are distinct entities formed from different processes. Regarding the cluster M45, the blue giants within it are not necessarily close relatives like our sun and Sirius; their proximity in the sky is a result of perspective rather than a physical relationship. Understanding these celestial bodies highlights the diversity of stellar evolution and classification.
Aftermarth
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Ok two questions for all u smart people out there:

1. What is the difference between a pulsar and a brown dwarf? are brown dwarves just dead white dwarves?

2. M45. A cluster of blue giants in the sky. Are they actually close relative to each other like our sun and Sirius or Alpha Centauri, or is it just a coincidence they appear like that in the night sky?
 
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1. What is the difference between a pulsar and a brown dwarf? are brown dwarves just dead white dwarves?

A pulsar is a type of neutron star that is formed after a massive star goes supernova. A brown dwarf is planet several times the size of Jupiter that isn't quite massive enough to create nuclear fusion in its core.
 

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