Stars MO to Binary

M0
--

The first star that you unlock is this type. It's a red dwarf. It has habitable zone ranging from 0.19 AU to 0.48 AU, before disappearing entirely after the star's "death". These stars last for an estimated 10 trillion years, the last stars surviving. So they are a preferred choice for creating large systems. They are red in color, with 0.5 solar masses. You have about 18 and a half days to establish life on planets in this system. Additionally, the planet "death zone" around an M0 star is so small its basically non-existent, allowing you to place planets literally inside of the star. ***These last 27 days until they die (3 weeks and 6 days).***

K0
--

This star which is unlocked from the very beginning. It is an orange dwarf. It has 0.8 solar masses. It's habitable zone ranges from 0.46 AU to 1.15 AU, increasing to 2 to 4.7 AU during hydrogen fusion, then spiking to 30 to 76 AU during the helium flash, then lowering to 9 to 24 AU during helium fusion, then spiking to 340 to 850 AU during the red giant stage, before dropping to 0.48 to 1.2 AU after the star's death. This star's lifespan until it settles is 26.6 billion years. You have about 12 days to establish life in this system. ***These last 18.5 days.***

G0
--

These stars are unlocked on level 5 and are the same class as the sun. They are yellow dwarfs with 1.1 solar masses. Their lifespan until a white dwarf is 11,550,000,000 years. Their Habitable zone is in between 0.68 and 1.7 AU, increasing to 3 to 7.6 AU during hydrogen fusion, then spiking to 30 to 76 AU during the helium flash, then lowering to 9 to 24 AU during helium fusion, then spiking to 340 to 850 AU during the red giant stage before dropping to 0.48 to 1.2 AU after the star's death. Our Sun (Sol) classifies as a G2V star, meaning that it's a G2 Main Sequence (V) star. You have about 7 days to establish life in this system. ***These last 11.55 days.***

F0
--

FO stars are unlocked at level 10 and are slightly larger than our the sun. They are classified as yellow-white dwarfs, and are 1.7 solar masses. They have a habitable zone of 1 to 2.8 AU, increasing to 8 to 21 AU during hydrogen fusion, then spiking to 30 to 76 AU during the helium flash, then lowering to 9 to 24 AU during helium fusion, then spiking to 340 to 850 AU during the red giant phase before dropping to 0.48 to 1.2 AU after the star's death, and a total lifespan of 2,200,000,000 years. It is only the smallest kind of star to sustain a helium reaction, although this lasts for > 0.1 million years. You have 6 and a half hours to establish life in this system. ***These last 2.8 days.***

A0
--

This type of star is unlocked at level 15, and has a common name of a blue-white star, not being a dwarf or giant star. They have a mass of 3.5 solar masses, and have a short lifespan of just 461,001,000 years. They have a habitable zone of 6 to 15 AU, increasing to 21 to 54 AU in the hydrogen fusion stage, then increasing further to 40 to 100 AU in the helium fusion stage, then increasing even further to 340 to 850 AU in the red giant stage, before dropping to 0.3 to 1.2 AU after the star's death, although there is not enough time to begin life around this star type. ***These last 7.7 hours.***

B0
--

B0 stars are unlocked at level 20. This star is too hot and cannot not have any rocky planets. They go supernova at the end of their life, turning into a neutron star. They have a habitable zone of 96 to 240 AU, increasing to 170 to 423 AU in the hydrogen fusion stage, before completely disappearing entirely after the star's death, although there is not enough time to begin life around this star type. ***These last 10 minutes.***

O5
--

O5 stars are unlocked at level 25. This star dies off too fast to have any planets around it and dies as a black hole, but has a habitable zone of 370 to 1000 AU, increasing to 500 to 1200 AU in the hydrogen fusion stage, before disappearing entirely after the star's death. ***These last 1.2 minutes.***

## GO/MO binary

The G0/M0 binary star system is unlocked at level 30. They have a habitable zone of 0.7 to 1.77 AU and have a life span of 11.55 billion years. The M0 star partner is absorbed by the G0 star in the Helium Flash stage, and the G0 star ends its life as a white dwarf. However, the G0/M0 binary has messed up star life stages, leading it to technically go through the expansion stages (as indicated by planets with life losing any life they had, and close enough planets eventually getting deleted) without it actually expanding, so after planets lose life on a G0/M0 binary this way you can just restart life as if nothing had really happened. Additionally, this causes this star system to survive for 13.8 billion years instead of the intended 11.55 billion years.

***These last 11.55 days***

## K0/M0 binary

This is an unused star type found in the game's code that was likely the original binary pair system before being replaced by the G0/M0 binary, with its position in several areas of the code implying that. It has a habitable zone range of 0.46 to 1.15 AU, the same as a K0 star. It is unknown how long it lasts for, however it would likely last for the same amount of time as a K0 star and end as a white dwarf. The star system stages for a K0/M0 binary are unfinished, containing only the star formation, gas giant, moon, rocky planet and main sequence stages. Does not have any icons of it ingame, however this is likely because they were overwritten with the G0/M0 binary icons that we got instead

## (M0/M0)/(M0/M0) double binary

A likely planned star system type containing 2 binary pairs of 2 red dwarfs each orbitting eachother, with the only evidence of its existence being an unused icon sprite in the game files named "double\_binary\_icon".

## Brown Dwarf

This is an unused star type found in the game's code. The brown dwarf star type has its own unique surface texture, and would have the colors #882200 and #AA4422. This star wouldnt actually be able to be used as the star of a star system, but would instead be added to a star system by placing down a huge gas giant. Similarly, placing down a gigantic gas giant would add an M0 red dwarf to the system.