1. the Andromeda Galaxy

Our Milky Way is just one of many galaxies in the Universe. The Andromeda Galaxy (M31, RNGC # 224) is a large spiral galaxy and is our closest neighbor at a distance of 2.2 million light years. It has approximately 1 trillion stars.

The Andromeda Galaxy
The Andromeda Galaxy

"The nature of the Andromeda realm is abstract and fluid. A dimensional doorway exists in our nearby galactic neighborhood as a bridge to the Andromeda Energy. This bridge/doorway is the star Antares." (Lyssa Royal & Keith Priest, The Prism of Lyra)
Many sources mention Andromeda as the home of several higher dimensional species. Some of these species chose to come and assist Earth in its current day Ascension progress. To adapt to a life in a 3-dimensional body, these Starseeds usually go through Antares.

Information about the inhabitants of the Andromeda galaxy that are visiting Earth is usually channeled.

2. the Andromeda Constellation

Andromeda is not only a galaxy, but also the name of an astronomical constellation. It is located above the constellations of Aries and Pisces. Its brightest star is called Alpheratz.

Several sources, including "Branton," mention that the Adromedans are member of the Federation of Planets.
There also is a strong connection with the Pleiadians. (When referring to the "Federation of Planets" some authors actually speak of the "Andromedan/Pleiadian Federation" or the "Andromedan Federation").

Some people claim to have been in contact for a long period of time with the inhabitants of a planet within the Andromeda constellation. Alex Collier is one of them. He says that "they are the oldest race in our galaxy and are very concerned about our future. They have light blue skin, but when they age, the skin becomes more white. The average age of Andromedans is 2007 years." (Quoted by Chuck Roberts in his Mystical Encyclopedia). [It is worth pointing out that Collier made all kinds of predictions that he was allegedly told about by his Andromedan contacts. Virtually none of those came true].

Wendelle Stevens mentions another Andromedan contactee. In 1972, Mexican Professor Hernandez was told by one of his students, 'Lya, that she came from the planet Inxtria, revolving around Beta Andromeda (Mirach, 197 light years away). Her message mainly was one of ecological concern. Interestingly, in July 1980, three people within two days met extraterrestrials in Johannesburg, South Africa, who claimed to come from the same planet in the Andromeda system that Lya came from.

Contactee Sixto Paz Wells claims to be in contact with Andromedans who look like regular humans (Humanoid phenotype): they are about 6'2" (1.85m) tall and hairless; they have small eyes and a reddish skin tone.

3. Greek Mythology.

Andromeda was the daughter of Cepheus and Cassiopeia, the legendary (white) King and Queen of Ethiopia. Andromeda was kept prisoner, chained to a rock near the sea, waiting to be eaten by Cetus, the great Sea Monster. She was saved by Perseus.
(The Story is a copy of a Babylonian Story in which the Hero is called Bel Marduk).