Codex Entry:(Planets and Locations) Minor Alliance Colonies and Orbital Stations
A significant portion of humanities population are found in the star systems within 100 light years of its homeworld. These colonies orbit the smaller and less hospitable red dwarf stars as well as the other 500 G type stars though only 40% of them have planets in the habitable red dwarf orbiting stars are primarily to house the Alliance fleet or joint colonies with other races as well as mining bases. Most of those colonies are guarded by a portion of the Alliance's fleet due to their small size. Total population of the red dwarf colonies and yellow dwarfs without habitable planets are only 14.7billion Humans and Saurians and 20 billion Rachni. Those around major yellow dwarf stars systems with habitable planets number 1.5 trillion and going up rapidly. The rest of the population is distributed across thousands of colonies scattered across the galaxy.
Codex Entry:(Planets and Locations) Gaudium
Gaudium is a major Alliance colony located in the Chara star system. It is the 4th planet from the star with 3 hot inner planets further in. Gaudium is considered a garden world with it being the first planet humanity encountered with native animal stage life. Gaudium has a widespread entertainment industry with many Human and Saurian movies being created on the planet. The planet also has many casinos and hotels that make it a popular tourist site for the wider galactic population. Gaudium has a population of 10 billion and its moon has a population of 2 billion.
Codex Entry:(Planets and Locations) Bhumi and Aphrodite
Planet Bhumi and Aphrodite are the largest Systems Alliance colonies in the galaxy.
Both planets are part of a double planet system in the Alpha Mensae system. Bhumi is a terrestrial planet 25% larger than earth though its gravity is comparable due to its lower density. It's orbiting companion is larger and heavier than Mars and orbits 850000km away. Planet Bhumi has a population of 18 billion and its partner Aphrodite has a population of 10 billion.
Codex Entry:(Planets and Locations) Arcturus and Arcturus Station
Arcturus is a fairly minor star system for population but is a major military hub of the Alliance and considered important due to the presence of mass relays near them. Arcturus has no planets due to them being destroyed by the star centuries ago. But a 36 km O'Neill style space station known as Arcturus Station is a major military base housing over 300,000 people. The 1st fleet is held there to protect earth and its colonies from possible invasion. The station is considered a feat of engineering being nearly the size of the citadel.
Codex Entry: (Ships and Vehicles) The Destiny Ascension
The Destiny Ascension is an asari dreadnought and flagship of the Citadel Fleet.
It is a starship of stunning power and size. The Destiny Ascension is the largest ship ever built using the mass effect. Over 2900 Meters in length and 5500 Meters in height, it's one of the largest ships in the known galaxy. It's main gun is a particle beam cannon of massive power, rivaling an entire fleet in raw firepower. The Destiny was built during the Terminus war as a symbol of the Citadels power, during the course of the war it destroyed 3 fleets with it's hundreds of mass drivers capable of destroying frigates and Cruisers in a single volley.
The Ascension is currently commanded by the asari Matriarch Lidanya.