There are a lot of unknowns in space but here are my top 10 unanswered questions.
01. What’s inside a black hole?
02. What’s the Universe expanding into?
03. What is dark energy?
04. What’s dark matter made of?
05. Where is all the antimatter?
06. What happened in the first 10^-43 seconds of the Universe?
07. What came first: the galaxy or the black hole?
08. What causes fast radio bursts?
09. Why does the Sun’s magnetic field flip?*
10. Does life exist on other planets?
The artwork in the background is a scientifically accurate map showing the orbits of more than 18000 asteroids in the Solar System, created by Eleanor Lutz.