How will the Universe die?

How long will the Universe last, and what are the possible fates?

What is making the Universe explode?

How we learned that something is tearing the Universe apart, and what it might mean.

Will an Asteroid Kill You?

Could humans go the way of the dinosaurs: extinction by space rock?

What's Inside a Black Hole?

What is a black hole, and what would it be like to fall into one?

How Big is the Universe?

Does the Universe go on forever, or have an end? What shape is it?

What is Dark Matter?

How dark matter was discovered, and what it might be

What is everything made of?

What's the smallest piece of matter? Is there one? 

What are Gravitational Waves?

What does it mean for gravity to make waves? How do we see them?

When will the Sun explode?

How long can we enjoy the sunshine before we need a new star?

Is Time Travel Possible?

Do any science fiction movies get time-travel right? Will it ever be possible?