Kolob, as explained in Abraham chapter 3, is the star "nearest unto the throne of God; and there were many great ones which were near unto it." The Lord describes Kolob as the "the greatest of all the Kokaubeam (stars) that thou hast seen, because it is nearest unto me." The scriptures aren't clear on what is meant by "greatest," except to say that it is the nearest star to God's dwelling. And whether the term star was being used in the exact same definition as its use today isn't clear. Abraham 3, with the whole discussion of the cosmos, is one of the most beautiful metaphors of Jesus Christ. Abraham got the most incredible object lesson imaginable. But the prophets have never suggested that the vision was ONLY a metaphor. Actually, there have been many things said implying that it is very literal. The scriptures are packed with true stories that illustrate grand principles and provide incredible types of the Savior. Actually, the more science learns, the more it falls in line with what the prophets have been teaching for centuries. What once sounded to people like strange mythology (such as the idea of the sun rotating around something bigger, and that rotating around something bigger than that), is now known scientific fact. Regarding the Eden/earth traveling through space question, we know very little. One quote that suggests this idea came from Brigham young, when he said, "This earth is our home, it was framed expressly for the habitation of those who are faithful to God, and who prove themselves worthy to inherit the earth when the Lord shall have sanctified, purified and glorified it and brought it back into his presence, from which it fell far into space. . . "When the earth was framed and brought into existence and man was placed upon it, it was near the throne of our Father in heaven. And when man fell. . . the earth fell into space, and took up its abode in this planetary system, and the sun became our light. . . "When it is glorified it will return again unto the presence of the Father, and it will dwell there.” - Brigham Young, Journal of Discourses, (London: Latter-day Saints Book Depot, 1874), 17:144 Joseph Smith said, "This earth will be rolled back into the presence of God, and crowned with celestial glory." (Teachings of the Prophet Joseph Smith, page 181) Not sure what that means, but it's awesome.