Light offers the most intuitive argument for an extremely old universe, both by its fundamental speed limit, and what it reveals.
The speed of light can be observed directly, for example by the delays in exchanging signals with spacecraft and satellites. It is also tied to so many physical constants (in e = mc2, c is the speed of light) that it is difficult to even imagine it changing. Parallax measurements taken from either side of the Earth's orbit of the sun show nearby stars appearing to move relative to distant stars, making stellar distances easy to calculate with simple trigonometry, so that we can say how long their light would take to reach us.
Young-Earth Creationism (YEC) typically claims that the universe is in the order of 10,000 years old. However, most stars are significantly further away than 10,000 light years. The nearest galaxy comparable to our own is Andromeda, more than two million light years away. When we look at that galaxy, we don't see it as it is now, but as it was when its stars released the light which has only now reached us. The question for YEC becomes: Did those stars exist two million ago?
There are two general responses offered to this question. The first invokes God's omnipotence. For a being to create all of space and time from nothing creates the reasonable expectation that any part of it could be subsequently recreated at will; with enough knwoledge and power, no physical task is even difficult. Hence, the stars could have been created along with their light, since their purpose was to give light to the earth. The second response invokes general relativity and big-bang cosmology, to argue that the expansion of the universe could have occurred in such a way that light crossed what were then smaller distances at a speed that was effectively much faster than light could now travel.
In the first case, sreating stars with their light already shining on the earth seems like a neat enough solution, except when we consider that light, by its nature, also shows us what the stars looked like, and what events occured to them at that time. Supernova 1987A, for example, showed the death of star that cataclysmically exploded 160,000 light years away (which is to say, 160,000 years ago). Did that star ever exist? If not, then why would God create light from it to shine upon the earth? Why would he make it look as if that star had existed, when it really had not?
This is an appearance of age
argument. It says that God is deliberately making a young universe look old, which seems to imply not only dishonesty, but dishonesty for no apparent reason. If you're timeless and eternal as well as omnipotent -- as the act of creating time and space from nothing suggests -- then why not just create them in the (equally accessible) distant past?
In the second case, the argument from general relativity has only been made by Russell D. Humphreys in Starlight and Time. To understand the theory, and the critiques that have been offered of it, requires an understanding of some advanced physics, which will not be covered here. Although the view is presented in some popular YEC publications and websites as a credible theory, it has been critiqued in detail by seemingly all qualified reviewers, including Christian physicists (see links). It would be reasonable to discount the theory until it manages to find some more adherents amongst those who understand it.
Presently then, the universe can be agreed to be at least as old as cosmic distances imply. And the most distant stellar objects are presently thought to be at least 10 billion light years away.
What does this mean then? Does Genesis imply (or God thereby declare) that the earth is really so young as the YEC position suggests? Does the Anthropic Principle indicate that the universe shows a suggestive degree of physical fine-tuning? Does a large universe diminish human significance?
The following summary is largely from Harry L. Poe and Jimmy H. Davis' Science and Faith: An evangelical dialogue.
The most interesting views on the subject appear to be:
Fully Gifted Creation
Orthogenesis, whereby evolution occurs
in a directed, goal-oriented way. Chardin influenced the Russian Orthodox geneticist and evolutionary biologist, Theodosius Dobzhansky.
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