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Thanks to Prof. Geraint Lewis for input on earlier drafts of this video.
The expanding universe is a complicated place. During inflation the universe expanded faster than light, but that’s something that actually happens all the time, it’s happening right now. This doesn’t violate Einstein’s theory of relativity since nothing is moving through space faster than light, it’s just that space itself is expanding such that far away objects are receding rapidly from each other. Common sense would dictate that objects moving away from us faster than light should be invisible, but they aren’t. This is because light can travel from regions of space which are superluminal relative to us into regions that are subluminal. So our observable universe is bigger than our Hubble sphere - it’s limited by the particle horizon, the distance light could travel to us since the beginning of time as we know it.
Scientists are getting closer than ever to understanding the origins of the Universe. For the first time, they have glimpsed behind the veil that covers the ‘Big Bang’ with the announcement that the Background Imaging of Cosmic Extragalactic Polarisation — BICEP2 — experiment at the South Pole had spotted the footprints of something called primordial gravitational waves. These waves may be a sign that a theory known as cosmic inflation can be confirmed. For those studying the Big Bang — the beginning of the Universe — this is big news.
We all know the theory surrounding the early development of the universe thanks to the cosmological model of this development called the Big Bang Theory. With the age of the universe pinned at 13.798 billion years ago, the universe has been around for an extremely long time.
There are many theories on how the universe will end or maybe it will never end and will continue expand forever. Dark energy, the equation of state and the shape of the universe all play a role on the fate of the universe.
Check out our latest video which goes over ways the universe could end!