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Solar System is a 2024 documentary TV mini series produced by the BBC and narrated by Brian Cox. The first episode was shown on BBC Two on 7 October 2024, [1] with the remaining four episodes made available on BBC iPlayer on the same date. [2] It follows Cox's previous series Wonders of the Solar System, shown in 2010, and The Planets, shown in ...
The physical universe is defined as all of space and time [a] (collectively referred to as spacetime) and their contents. [10] Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space.
This episode explores the theories of the big crunch, the big rip and the big freeze, that are postulated by physicists as possible fates for the universe. [3] Al-Khalili indicates that the difficulty in understanding this is our limited ability to comprehend something of such immensity both physically and philosophically. [4]
GCSE Bitesize was launched in January 1998, covering seven subjects. For each subject, a one- or two-hour long TV programme would be broadcast overnight in the BBC Learning Zone block, and supporting material was available in books and on the BBC website. At the time, only around 9% of UK households had access to the internet at home.
The universe consists of a plasma of nuclei, electrons, and photons; temperature is too low to create electron-positron pairs (or any other pairs of massive particles), but too high for the binding of electrons to nuclei. Recombination: 18 ka ~ 370 ka 6000 ~ 1100 4000 K (0.4 eV) Electrons and atomic nuclei first become bound to form neutral ...
The universe is a four-dimensional spacetime, but within a universe that obeys the cosmological principle, there is a natural choice of three-dimensional spatial surface. These are the surfaces on which observers who are stationary in comoving coordinates agree on the age of the universe .
The comoving distance from Earth to the edge of the observable universe is about 14.26 gigaparsecs (46.5 billion light-years or 4.40 × 10 26 m) in any direction. The observable universe is thus a sphere with a diameter of about 28.5 gigaparsecs [27] (93 billion light-years or 8.8 × 10 26 m). [28]
Since the universe is expanding, the equation for that expansion can be "run backwards" to its starting point. The Lambda-CDM concordance model describes the expansion of the universe from a very uniform, hot, dense primordial state to its present state over a span of about 13.77 billion years [12] of cosmological time.