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)
S-Type SG/Giant Star
Star Classification: S
Luminosity Classification: III
Temperature (K) : 2900
Mass: Low to intermediate mass (similar to Red Giants)
Elemental Composition: Zirconium oxide, carbon, oxygen
Description: Rare giant stars with nearly equal carbon and oxygen, showing zirconium oxide bands.
Birth: Red giant with zirconium-rich atmosphere
Life: Transitional between M-type and carbon stars
☠️ Death: Planetary nebula
Reincarnation: White dwarf
Example: Chi Cygni, R Andromedae
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)
