#418: From Cosmic Drag to Holographic Hype: Unraveling the Mysteries of Space Travel

Prepare to have your mind stretched to the cosmic limits in this Q&A episode of Space Nuts. Andrew Dunkley and Professor Fred Watson answer a selection of thought-provoking questions sent in by our curious listeners, tackling the mysteries of light, the concept of a holographic universe, and the challenges of interstellar travel.
First up, Alan from Medicine Hat, Canada, wonders how far light from an LED with one candle power can travel before it becomes undetectable by space telescopes. The duo discusses the persistence of light and the factors that influence our ability to observe its journey through the cosmos.
Next, Charles probes the perplexing theory of a holographic universe, questioning whether our three-dimensional experience is merely a projection from a two-dimensional boundary. Andrew and Fred unravel the theoretical underpinnings of this mind-bending concept and its implications for our understanding of reality.
The conversation then accelerates to relativistic speeds with Craig from sunny Merimbula, NSW, asking how fast a spacecraft must travel before encountering drag in the sparse medium of space. They also consider the potential hazards of high-speed collisions with cosmic dust and gas, pondering the aerodynamic and navigational challenges that would arise.
From the eternal voyage of light to the enigmatic nature of our universe and the theoretical speed limits of space travel, this episode of Space Nuts is a cosmic conundrum of astronomical proportions. Tune in as Andrew and Fred navigate through the universe's most intriguing puzzles.
00:00:00 Andrew Dunkley answers questions about light on this edition of Space Nuts
00:01:38 First question comes from Alan from Medicine Hat, Canada
00:03:44 There is no known limit to how far light can travel
00:06:03 Charles: What do you think of the theory that we live in a holographic universe
00:13:46 If all universes are expanding, would they eventually overlap
00:17:41 Craig Miller calls from sunny Merimbula in New South Wales
00:19:03 How much speed would drag depend on the concentration of particles in space

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