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2020-05-04: How We Know The Universe is Ancient

  • 09:39: ... made an awkward mistake - they had been counting bright clouds of hydrogen gas - so-called HII regions - as stars, which threw their numbers off. It ...

2019-06-20: The Quasar from The Beginning of Time

  • 05:43: ... Bang, when things had cooled down a bit, the universe was filled with hydrogen gas. It was murky, especially for ultraviolet ...

2019-06-06: The Alchemy of Neutron Star Collisions

  • 02:47: ... to map where along the line of sight to a quasar there are clouds of hydrogen gas and learn about their size and density based on the shape of the ...

2019-05-16: The Cosmic Dark Ages

  • 05:45: ... about the first, so this is just the tl;dr. When the electron in cold hydrogen gas flips its spin direction it either absorbs or emits a radio photon with ...
  • 08:30: Neutral hydrogen gas is hungry for Lyman-alpha, gobbling up any such photon that it encounters.

2018-03-21: Scientists Have Detected the First Stars

  • 01:05: [MUSIC PLAYING] So the very early universe was full of hydrogen gas and light.
  • 01:27: We can also, try to see the light signature from that very early hydrogen gas.
  • 02:13: Before long, some of that early hydrogen gas collapsed to form the very first stars, long before the first galaxies formed.
  • 04:50: Our cosmological models can't explain how this early hydrogen gas could possibly be this cold.

2017-05-31: The Fate of the First Stars

  • 08:36: ... which saw the universe shift from being a hazy, nearly opaque fog of hydrogen gas to the crystal clear and extremely diffuse hydrogen plasma that we see ...

2017-02-22: The Eye of Sauron Reveals a Forming Solar System!

  • 02:17: Cold and adrift, the mostly hydrogen gas yields to gravity once it reaches the critical Jeans mass.

2017-01-25: Why Quasars are so Awesome

  • 07:21: The first quasars turned on in a very young universe that was still thick with the raw hydrogen gas produced in the Big Bang.

2016-12-21: Have They Seen Us?

  • 07:33: One of its primary purposes will be to catch the radio emission from hydrogen gas in the extremely early universe.

2016-03-09: Cosmic Microwave Background Challenge

  • 00:23: ... down enough for the hydrogen plasma that filled the universe to become hydrogen gas. ...

2015-09-30: What Happens At The Edge Of The Universe?

  • 08:51: By comparison, the cold hydrogen gas that fills our galaxy clumps together in giant clouds.
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