Hi, Dan. Sorry this is long, but it's some information I saved on my computer, also being interested in all such things over the years.
Young earth creation and starlight, light years, explained in terms of time dilation:
Time dilation
An experimentally verified prediction of Einstein's General Relativity Theory is a phenomenon called gravitational time dilation. It has long been established that gravity affects the rate at which time flows in any particular location in the universe. A graphic example of this phenomenon is the GPS satellite navigation system which is becoming a standard feature in many motor vehicles today.
It has long been established that gravity affects the rate at which time flows in any particular location in the universe. A graphic example of this phenomenon is the GPS satellite navigation system which is becoming a standard feature in many motor vehicles today.
One's position is determined by comparing the time taken for signals from a number of the satellites, which are visible at any one time, to reach the receiver so very high precision timing is needed. The constellation of satellites orbits the earth at an altitude of about 20,000km. At this height, the atomic clocks on board the satellites run faster than the same clocks on earth by 42 microseconds per day. The satellites are travelling at around 12,000 km per hour which produces an opposing relativistic effect of slowing the clocks down by about 5 microseconds per day. The combined effect is that the clocks on the GPS satellites run 38 microseconds per day faster than equivalent earth-bound clocks. Why does this matter? If this time difference was ignored and no compensation made, the position errors would build up at a rate of about 400m per hour which would render the system completely useless!
Another mechanism for time dilation is rapid acceleration of the fabric of space in an expanding universe. This is explained more fully in Hartnett's book referenced above.
God stretched out the heavens
In at least 11 places, the Scriptures speak of God 'stretching out the heavens' (e.g. Job 9:8, Isaiah 40:22 and 42:5, Jeremiah 10:12, Zechariah 12:1) and in Genesis 1:15 the words 'And it was so.' are recorded in connection with the events of Day 4 of Creation Week, implying the completion of the events described on that Day. It is a reasonable conclusion to draw that God stretched out the heavens to the vast extent of the observable universe in just one 24 hour day and then ceased the action of 'stretching out'. This is more rational than the inflation fudge of big bangers. That is, where the universe just happened to expand much faster than light, although there is no known physical cause for starting or stopping this superluminal expansion.
We should also note that God created the Earth first before the sun, moon and stars (and by inference the planets etc) so it would seem reasonable to assume the universe was stretched out with the Earth at or very near its centre. Furthermore, Psalm 147:4 and Isaiah 40:26 imply that there is a finite number of stars in the universe. So, the Bible seems to teach that we live in a finite universe that has, at the very least, our Milky Way galaxy at its centre.
Distant starlight and the biblical timescale
We now have the keys to understanding how starlight can reach us from such vast distances in just a few thousand years of Earth time. The days of the Creation Week were recorded from the point of view of an observer on the earth so the time reference in Genesis is Earth time. On Day 4, as God commenced stretching out the heavens, the mass of the universe (presumably including the 'waters above' which were separated out on Day 2) would have been confined to a much smaller volume of space than is the case today. Assuming the Hartnett–Carmeli theory is correct, the Universe rapidly expanded with massive time dilation as a result of very rapid acceleration of the fabric of space on Day 4. The Humphreys model5 on the other hand, also based on General Relativity, has clocks at the outer edge of the cosmos running much faster than earth-bound clocks because of gravitational time dilation.
By the end of Day 4, when God completed his work of creating the sun, moon and stars, and had stretched out the heavens to their vast extent, billions of years of cosmic time could have elapsed at the outer edges of the cosmos in just one 24 hour earth day. There would have been more than enough time for the light from distant stars to have reached the earth so that when Adam gazed at the night sky on that sixth night he would have seen much the same as what we see today.
6,000 years have passed since the Creation Week. If the models outlined above are correct, the light from any star that is greater than 6,000 light years away from the earth will have originated on Day 4 itself. This would include most of the visible stars, all of which are part of the Milky Way galaxy. We are effectively looking at God's creative activity on Day 4 as we gaze into the universe!
So what do we make of supernova 1987A? At 170,000 light years away we are looking at an event that occurred on Day 4 but whose light did not reach us until 1987.
Is an exploding star consistent with a perfect creation? God said that the stars were created to be for signs and seasons (Genesis 1:14) and God foreknew all that would happen right from the very beginning. What to us seems to be destruction is actually just a physical process which does not necessarily denote any lack of perfection in the original creation. Importantly, there is no loss of biblical life involved.