Einstein's theory of General Relativity is an extension of Special Relativity into the general case of non-inertial frames, the result is a theory of gravity that extends and corrects Newtonian gravitation. According to General relativity, gravity results from a space-time distortion caused by the presence of a mass. From an experimental and demonstration standpoint, this is mechanically and mathematically much like placing a weight on a rubber sheet, then observing the behavior of other objects rolled in a near-tangential path.
General Relativity has to date passed every experimental test devised for it, making it one the best verified theories in Physics. Surprisingly it is has proven to be quite useful to creation science and it actually supports some aspects of Biblical teaching.
For a detailed description of General Relativity see the article "The General Theory of Relativity."
Gravitational time dilation
One of the most verified aspects of General relativity is gravitational time dilation. Dr. Russell Humphreys shows in his White Hole Cosmology that gravitational time dilation can solve the problem of getting distant star light to Earth even though creation occurred less than 10,000 years ago. General relativity not only provides a solution to to the distant star light problem but can solve other Cosmology problems as well.
General relativity and the Bible
Special Relativity shows that time is an integral part of the structure of the universe, and not just the perceptions of a sequence if events. The result is that anything outside the universe would be timeless or have its own time. General Relativity requires at least one additional dimension beyond space-time, this shows that there is an outside. Such an out side would be timeless and by definition, it would be what the Bible refers to as eternity.