Contents

Introduction

WHAT IS THE UNIVERSE?

The human quest to know what’s out there

HOW BIG IS THE UNIVERSE?

The cosmological distance ladder

HOW OLD IS THE UNIVERSE?

Cosmology’s age crisis

WHAT ARE STARS MADE FROM?

The cosmic recipe

HOW DID THE EARTH FORM?

The birth of the planet we call home

WHY DO THE PLANETS STAY IN ORBIT?

And why the Moon doesn’t fall down

WAS EINSTEIN RIGHT?

Gravitational force versus space–time warp

WHAT IS A BLACK HOLE?

Gobbling monsters, evaporating pin pricks and balls of string

HOW DID THE UNIVERSE FORM?

Picturing the Big Bang

WHAT WERE THE FIRST CELESTIAL OBJECTS?

The beginnings of the Universe as we know it

WHAT IS DARK MATTER?

The debate about what holds the Universe together

WHAT IS DARK ENERGY?

The most mysterious substance in the Universe

ARE WE MADE FROM STARDUST?

The mystery of how life emerged

IS THERE LIFE ON MARS?

The chances of finding we have neighbors

ARE THERE OTHER INTELLIGENT BEINGS?

Is anyone out there?

CAN WE TRAVEL THROUGH TIME AND SPACE?

The possibility of warp drives and time travel

CAN THE LAWS OF PHYSICS CHANGE?

Physics beyond Einstein

ARE THERE ALTERNATIVE UNIVERSES?

Schrödinger’s cat and the implications for us all

WHAT WILL BE THE FATE OF THE UNIVERSE?

Big crunch, slow heat death or big rip

IS THERE COSMOLOGICAL EVIDENCE FOR GOD?

The apparent fine tuning of the Universe for human life

Glossary

Index