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)
K-Type Star
Star Classification: K
Luminosity Classification: V
Temperature (K) : 4500
Mass: 0.45–0.8 M☉ (main-sequence)
Elemental Composition: Hydrogen, Helium, metals, molecular bands
Description: Orange Stars between 3,900-5,300 K. Cooler than the Sun, often living for tens of billions of years.
Birth: Collapse of small–medium clouds
Life: Orange, long-lived, stable fusion
☠️ Death: Red giant
Reincarnation: White dwarf
Example: Epsilon Eridani, Alpha Centauri B
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)
