What is an axion? How could axions make a star, and what does that have to do with dark matter? What would these stars look like?
Where do parallel universes exist? Could we use wormholes to travel to them? What does time travel have to do with all this?
What is the Fermi Paradox? How rare is non-intelligent vs intelligent life? What are the challenges a species must overcome to colonize the galaxy? Where is everybody?
Are dark photons as sinister as they sound? What did the curvaton do in the early universe? And is everything really made of preons?
How can the solar corona be hotter than the surface? What has the Parker Solar probe learned so far? What do magnetic fields have to do with all this?