Actually the Bible begins with the creation of the Heaven and the Earth, not the universe. The two Great lights and the stars, were not made until the fourth day, after that I have difficulty with the "era" explaination, since they were for signs and seasons and days and years.
"The bible is also clear that light pre existed the sun and the moon...so the problem of vegation is moot.."
The problem of vegation is moot, only if you admit that the plants could get their energy from another source other than the sun or stars. That God assoiated the sun, moon and stars with the number 4 was no accident, you see it elsewhere in Scripture. I have difficulty with those who say God did not make the sun, moon and stars on day 4.
I took a college level class on creation a year ago and that was never pointed out..then last Sunday it was the topic of the adult Sunday school..it was an aaaaahhhhhaaaaa moment for me.
I do not know what you mean by the era explanation...I believe the Sun and moon were made to be like the trees and seed bearing vegation to be self existant..and they marked the day and night and measure time for us..I take the Biblical day as 24 hours..period!...