Ask a Spaceman!

How does the universe generate giant magnetic fields? Is it astrophysical or primordial? How do we find them anyway? Why am I not talking about Maxwell? I discuss these questions and more in today's A...

1 Aug 201729min

What's the deal with time crystals? Do they break physics as we know it? Or are they merely…neat? What do symmetries and the conservation of energy have to do with it? I discuss these questions and mo...

18 Juli 201734min

Do black holes exist, or are they merely theoretical constructs? What's the evidence? And what about the singularity, surely that doesn't happen, right? I discuss these questions and more in today's A...

4 Juli 201729min

Does everyone have the same clock? Can we skip forward into the future? What about the past? Why does it appear to be forbidden in our universe? I discuss these questions and more in today's Ask a Spa...

20 Juni 201720min

How is the bullet cluster the "smoking gun" for dark matter? Why aren't alternate theories of gravity satisfactory? Could dark matter just be a bunch of black holes? I discuss these questions and more...

6 Juni 201733min

Just how mediocre are we? I've heard there's an "axis of evil" in space - what's up with that? Is there anything special about our position within the universe? I discuss these questions and more in t...

16 Maj 201735min

How do we measure the expansion history of the universe? Why are supernovae so dang useful? Come on, what's with this "dark energy" business? I discuss these questions and more in today's Ask a Spacem...

2 Maj 201736min

What happens during a galaxy merger event? Is dark matter involved? How do we use simulations to learn about these processes that last hundreds of millions of years? I discuss these questions and mor...

18 Apr 201737min