Astrophysics bbc

  • How big is the universe BBC?

    Let's start by saying the Universe is big.
    When we look in any direction, the furthest visible regions of the Universe are estimated to be around 46 billion light years away.
    That's a diameter of 540 sextillion (or 54 followed by 22 zeros) miles..

  • How do we even know how big the universe is?

    Scientists measure the size of the universe in a myriad of different ways.
    They can measure the waves from the early universe, known as baryonic acoustic oscillations, that fill the cosmic microwave background.
    They can also use standard candles, such as type 1A supernovae, to measure distances..

  • How old is the universe BBC?

    That is because we can only see as far as light (or more accurately the microwave radiation thrown out from the Big Bang) has travelled since the Universe began.
    Since the Universe burst into existence an estimated 13.8 billion years ago, it has been expanding outwards ever since..

  • Astronomers Identify the Coldest Star Yet That Emits Radio Waves.James Webb Telescope Catches Glimpse of Possible First-Ever 'dark Stars'Rare, Double-Lobe Nebula Resembles Overflowing Cosmic 'jug'When the Stars Align: Astronomers Find Answers to Mysterious Action of Ghost Stars in Our Galaxy.Search for Dark Matter.
Dec 20, 2021Subscribe and to the BBC https://bit.ly/BBCYouTubeSub Watch the BBC first on iPlayer https
Duration: 4:50
Posted: Dec 20, 2021,All the latest content about Astrophysics from the BBC.,Astrophysics Paul Murdin shares his story of the first identification of a black hole, Cygnus X-1.
Catch up on the latest cosmological research that has  ,AstrophysicsAttribution.
Science & EnvironmentPosted.
17 August 202117 Aug 2021.

Could a telescope detect CFCs in Earth's atmosphere?

If some alien population had polluted their world the way we polluted ours in the 20th Century, telescopes might just be able to detect the presence of CFCs in their planet's atmosphere

It would be a hint, potentially, of a technology-rich culture elsewhere in the universe

What scientists call a "technosignature"


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