Special relativity is an explanation of how speed affects mass, time and space. The theory includes a way for the speed of light to define the relationship between energy and matter — small amounts of mass (m) can be interchangeable with enormous amounts of energy (E), as defined by the classic ...

In this week's Questions and Answers show, I explain how astronauts are trained to deal with medical emergencies if the Universe is expanding smoothly or chaotically, and what would survive longer, a white dwarf or a red dwarf? 00:00 Start 01:34 What if there's a medical emergency on the ISS? ...

In this week's live Questions and Answers show, I provide the exact number of alien worlds that could detect the Earth, are we made of heavier elements made in other galaxies, will lasers remain perfectly parallel in space? And more... To vote for the best question just post any comment ...

In this week's questions and answers show, I explain why people might see extraterrestrials as a threat. What could we learn about astronomy if we lived at the center of a supervoid, and how far away are we from the Big Bang? 00:00 Start 01:10 Why do we assume extraterrestrials are evil? 07:40 ...

Full podcast: https://www.youtube.com/watch?v=cP_SZBtgCCo I was a guest on the Eavesdrop postcast with OpTic HECZ last week. We talked about dozens of topics but the most fun by far was Aliens. I didn't know this but HECZ loves to talk about aliens so we talked about ancient aliens, cosmological ...