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2019-11-18: Can You Observe a Typical Universe?

  • 14:56: ... needs to last a reasonable amount of time, have stable regions and energy sources for those structures to form, and have some building blocks - whether or ...

2019-09-16: Could We Terraform Mars?

  • 09:04: There’s really no other viable energy source.

2019-03-13: Will You Travel to Space?

  • 07:28: ... than rockets at low altitude. As well as a combustible fuel as an energy source, rockets need to carry an oxidant to burn that fuel and a reaction mass – ...

2019-03-06: The Impossibility of Perpetual Motion Machines

  • 09:00: It has no energy gradient, so isn’t accessible as an energy source.

2019-01-30: Perpetual Motion From Negative Mass?

  • 13:32: I want a device that provides a continuous energy source.

2018-08-23: How Will the Universe End?

  • 08:25: If life manages to master this energy source, then its future history could be as ridiculously long as the Black Hole Era.

2018-04-11: The Physics of Life (ft. It's Okay to be Smart & PBS Eons!)

  • 04:46: By free energy, I mean the special out-of-equilibrium energy sources like a cup of coffee or the sun.
  • 07:11: But when our energy source is flowing into a much larger reservoir, why, the ocean, for example, then equilibrium is never reached.

2017-11-08: Zero-Point Energy Demystified

  • 07:09: And regardless of its strength, it's not accessible to us as an energy source or as a miracle resource for far space travel.

2017-11-02: The Vacuum Catastrophe

  • 04:23: As long as the vacuum energy is the same everywhere, then it's inaccessible to us as an energy source.

2017-01-11: The EM Drive: Fact or Fantasy?

  • 02:19: ... fundamentally limited by the fact that they have to carry not just an energy source, but propellant, a bunch of mass to shoot out the back end to push them ...

2016-09-29: Life on Europa?

  • 04:32: It's believed that an energy source and a rich mineral content in liquid water are the main ingredients needed for abiogenesis.
  • 07:13: Europa's ocean roof doesn't have an abundant energy source, and certainly not one that could power a 100-kilometer deep biosphere.

2015-12-09: How to Build a Black Hole

  • 01:58: So starved of an energy source, the stellar core collapses on itself.

2015-06-24: The Calendar, Australia & White Christmas

  • 06:40: acappellascience suggested that we put photovoltaics on the billboards as an energy source.
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