science
Dark Matter
Science · still open · since 1933
Fast Radio Bursts
Science · still open · since 2007
High-Temperature Superconductivity
Science · still open · since 1986
Matter-Antimatter Asymmetry
Science · still open · since 1964
Quantum Gravity
Science · still open · since the late 1960s
Supermassive Black Hole Origins
Science · still open
A Preferred Direction in the Sky
Science · still open · since 2003
The Coronal Heating Problem
Science · partially resolved · since 1869
The Hubble Tension
Science · still open
The Wow! Signal
Science · still open · since 1977
Wave-Function Collapse
Science · still open · since 1986
Why Do We Dream?
Science · still open
