Let’s see how the Creationist morons spin their way out of this:
Astronomers at UCal Davis announced that they’ve determined the dating of the earliest stage of the formation of the planets in our solar system (via). They estimate that the first stage, where metallic dust began to coalesce into small bodies, began approximately 4.568 billion years ago (give or take about 2 million years).
These initial clumps of metal eventually formed into about 20 Mars-sized bodies, then collided with one another to form the 9 (or 8, depending on how you feel about Pluto) planets extant today. The astronomers were able to establish a relationship between the amounts of manganese and chromium (two common elements found in contemporary meteorites) and thus were able to determine rough ages based on the amount of an isotope of chromium.
Or, y’know, you could go on thinking that the entire universe simply winked into existence 5000 years ago because that’s what’s written in the Bible. Your call.
When I graduated from UCal Davis, it was just 4.567 billion years after Creation. 4.568 billion years you say now? How time flies!