We’ve found lots of “habitable” worlds but we don’t know what factors are needed for life.
What is the graviton, and does it even exist?
Antimatter drives sound like science fiction, but they may not be as far as you think.
Does quantum mechanics allow the future to retroactively influence the past or not?
Life on mars could result in humanity’s destruction via Fermi Paradox.
Is there evidence for the existence of an enormous number of other universes?
How to build a particle collider the size of the solar system.
One of the most important reasons we go to space is to know our own planet better.
It may be that our very DNA inherited its twist from the underlying handedness of reality.