Explore how black holes warp spacetime, slow clocks near the event horizon, and reveal Einstein’s theory in action.

Explore the leading scientific ideas about what happened before the Big Bang, from cosmic inflation to quantum gravity, and where evidence is still missing.

Learn how old the universe is, how scientists calculate it, and why the current estimate is so precise.

Learn why cosmologists study dark energy, what it reveals about cosmic expansion, and how it shapes modern theories of the universe.

Learn what cosmic inflation is, why it matters, and how it explains the universe’s earliest moments.

Learn why gravity still works in space, why astronauts float, and how orbital motion creates the illusion of weightlessness.

Learn what general relativity is, how Einstein reshaped gravity, and why spacetime still powers modern physics and technology.

Learn how space radiation works, where it comes from, why it matters for astronauts, and how spacecraft reduce exposure.

Learn how time dilation works in special and general relativity, why moving clocks tick differently, and where the effect matters in real life.