A Brief History of Time

Kernaussagen

• Raum und Zeit sind verwoben; Masse krümmt sie wie ein Gewicht ein Tuch
• Das Universum dehnt sich aus – alles begann heiß und dicht
• Das Große folgt der Relativität, das Kleine der Quantenmechanik
• Schwarze Löcher strahlen und können langsam verdampfen
• Zeit hat eine Richtung, weil Unordnung wächst – darum erinnern wir Vergangenes

In diesem Bit

1. Das Universum einfach erklärt

   A scientist gives a public lecture on astronomy and an elderly listener insists the world rests on the back of a giant turtle. Asked what the turtle stands on, she replies that it is turtles all the way down.

2. Space and time bend

   For centuries, people thought of time as a universal clock ticking the same everywhere. Einstein overturned that.

3. Alles driftet auseinander

   In the 1920s, Edwin Hubble noticed that distant galaxies are moving away from us, and the farther away they are, the faster they recede. This is what an expanding universe looks like from the inside.

4. Die seltsamen Regeln des Mikrokosmos

   Relativity governs stars and galaxies, but a different set of rules runs the world of atoms. Quantum mechanics says that you cannot know both the exact position and exact speed of a particle at once; nature has a built-in fuzziness.

5. Black holes and the arrow of time

   A black hole forms when a massive star collapses so far that not even light can escape its gravity. For decades it was assumed nothing could ever come out.

6. In die Praxis umsetzen

   This week, step outside on a clear night and pick one star, remembering that the light entering your eye left it years or centuries ago, so you are looking at the past. Watch a short explainer on how GPS satellites correct for relativity, and you will see Einstein's ideas at work in your phone.