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)
Blue Giant
Star Classification: O-B
Luminosity Classification: III
Temperature (K) : 20000
Mass: 16–40 M☉
Elemental Composition: Hydrogen, Helium, ionized metals
Description: Massive, hot, bright blue stars with short lifespans found in young clusters.
Birth: High-mass star evolving off main sequence
Life: Hot, bright, short-lived
☠️ Death: Supernova
Reincarnation: Neutron star or black hole
Example: Alcyone, Pi Sagittarii
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)
