PX282 - A1 - a star
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a body bound by self-gravity
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radiates energy from an internal source
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massive enough for nuclear fusion of hydrogen atoms
this is a working definition, details are complex -
the baseline of the knowledge of stars comes from the sun
- spherical(ish), ie: self-bound
- the effective temperature,
- the radius,
- the mass,
- age
(from the age of the oldest moon rocks) - rotation period