1) Creationists, if God created plants on the third day and the sun on the fourth day...?
...how did he keep the plants from dying in the cold?
Some source of light and heat other than our Sun is the obvious answer. There are several reasonable possibilities, the most well-publicized one being "panspermia".
2) how did he get the sun to warm up the Earth sufficiently to support life in just one day?
We can safely (linguistically and logically) interpret the "1 day" as "1 age".
http://www.merriam-webster.com/dictionary/day
Considering that current scientific theory calculates that light from the Sun takes ***tens of thousands of years*** to reach Earth (no kidding - that's for real), we can be pretty sure that there was not just one day between the "igniting" of the Sun and a Sun-warmed Earth.
- Jim, http://www.bible-reviews.com/
P.S. No - not 8 minutes. Tens of thousands of years is correct.
http://www.omg-facts.com/view/Facts/50283?id=50283&c_val=1
Perhaps I should have worded it more carefully. It takes tens of thousands of years **from the time that the light is produced by the Sun** until it reaches Earth. It takes 8 minutes from the time that the light escapes the Sun until it reaches the Earth.