Ad Astra
M☉ Notation
Unit of measurement in
astronomy called the solar mass.
- M stands for Mass
- ☉ Astronomical Symbol/Sun
- 1 M☉, Benchmark unit
- Equal to mass of our Sun
The Sun
(NASA/ESA)
Spirograph Nebula
(NASA/ESA)
Hourglass Nebula
(NASA/ESA)
Neutron Star
Star Classification: Stellar Remnant
Luminosity Classification: Low....
Temperature (K) : 1000000
Mass: 1.44–2.2 M☉ (up to the Tolman-Oppenheimer-Vokoff limit of ≈ 2.9 M☉)
Elemental Composition: Neutrons, exotic dense matter
Description: Ultra-dense remnants of supernovae composed almost entirely of neutrons. (~1,000,000 K to >10,000,000 K)
Birth: Core-collapse supernova remnant
Life: Ultra-dense, rapidly spinning; may emit pulses
☠️ Death: Gradual spin-down
Reincarnation: Possibly merges into black hole
Example: Crab Pulsar, Vela Pulsar
Luminosity Classes
Added to spectral types.
Indicates size & brightness:
- 0 or Ia+: Hypergiants
- I (Ia, Ib): Supergiants
- II: Bright Giants
- III: Regular Giants
- IV:Subgiants
- V: Main Sequence
- VI (sd): Subdwarfs
- D (VII): White Dwarfs
Galaxy in Orange
(Wiki Images)
Wolf-Rayet Star
(NASA/ESA)
Planetary Nebula (PN K 4-55)
(NASA/ESA)
