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)
B-Type Star
Star Classification: B
Luminosity Classification: V, III, I
Temperature (K) : 15000
Mass: 2.1–16 M☉ (main-sequence)
Elemental Composition: Hydrogen, Helium, light metals
Description: Hot blue-white stars between 10,000-25,000 K with strong helium lines and high luminosity.
Birth: Formed from large, dense gas clouds
Life: High-mass, blue-white, strong stellar winds
☠️ Death: Supernova
Reincarnation: Neutron star or black hole
Example: Rigel, Spica
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)
