A coasting universe is older than a decelerating universe because it takes more time to reach its present size and expands forever. Though an age estimate is not possible at this time, this large size apparently would place its age well outside that of the recent creation model criterion of 7000 years. Once you figure out that the Universe is expanding, all you need to do is measure the expansion rate today and use the laws of physics to determine how the expansion rate must have changed over time. An increasing rate of expansion would mean the expansion rate was slower in the past. In that case, it took longer for the universe to reach its current size than it would have at today's rate, so the universe is older than we would predict from today's rate of expansion alone. The age of the Earth is estimated at a little over 4.5 billion years. For most of human history, the basic facts about the planet were unknown. The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time.

The expansion rate of the Universe can be used to determine its size and age, as well as serve as an essential tool for interpreting observations of objects elsewhere in the Universe.

Discussion I have described two young SNRs, the Crab Nebula and the Cygnus Loop, that are demonstrably younger than Davies’ recent creation criterion of 7000 years. Some model-dependent assessments also come close to that atomic date. An accelerating universe on the other hand is older still. Figure 2. You know approximately the distance based on the volume of the sound and you know it's is moving away from you because the tones are 'stretched'. Age of the Universe – Since The Big Bang? The universe's expansion, when doubled in size, causes all th dots to appear twice as far as they once were, from the perspective of the point of origin. The scale factor a(t) gives physical size to the spatial coordinates ~x, and the expansion is nothing but a change of scale (of spatial units) with time. It is an intrinsic expansion whereby the scale of space itself changes.The universe does not expand "into" anything and does not require space to exist "outside" it. The ambulance (police car/fire truck) just passed by. Except for peculiar velocities, i.e.

spatially flat universe, ds2 = dt2 − a2(t)d~x2 (the generalization of the following argument to curved space is straightforward). The problem was tackled by Earth scientists in the twentieth century.. Modern estimates are based on radioactive dating methods. Universe The Hubble Ultra-Deep Field image shows some of the most remote galaxies visible with present technology, each consisting of billions of stars. This means that the white and pink dots have appeared to move much farther from the point of origin compared to the blue and yellow dots, in opposite directions from the point of origin.
Models range in age from the early-Archaean to present-day, plus one model projected 5 million years into the future (Maxlow, 2001). The expansion of the universe is parameterized by a dimensionless scale factor = (with time counted from the birth of the universe), defined relative to the present day, so = =; the usual convention in cosmology is that subscript 0 denotes present-day values, so is the current age of the universe. In physical cosmology, the age of the universe is the time elapsed since the Big Bang.The best measurement of the age of the universe is 13.798±0.037 billion years ((13.798±0.037)×109 years or (4.354±0.012)×1017 seconds) within the Lambda-CDM concordance model.


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