A starship driven by a captive black hole sounds like pure science fiction, yet the underlying physics is brutally literal. A tiny, artificial singularity would convert mass into energy with an ...

Dark star -- A map of forever -- One hundred billion ways to the bottom -- The feeding habits of nonillion-pound gorillas -- bubbles -- A distant siren -- Origins : part I -- Origins : part II -- ...

Some things in cosmology may simply be unknowable. Why is there something rather than nothing? What lies outside the universe? What is inside a black hole? That last one has been niggling at ...

Centuries before anyone pointed a telescope at the sky, Isaac Newton figured out how gravity works. He showed that any object with mass pulls on every other object—a result that explained falling ...