Frequently asked questions about the universe

A frequently asked introduction

What can't I travel back in time?

Why haven't aliens visited us? Or have they?

Is there another you?

How long will humanity survive?

What happens if I get sucked into a black hole?

Why can't we teleport?

Is there another Earth out there?

What's stopping us from traveling to the stars?

Is an asteroid going to hit Earth and kill us all?

Are humans predictable?

Where did the universe come from?

Will time ever stop?

Is an afterlife possible?

Do we live in a computer simulation?

Why does E = mc²?

Where is the center of the universe?

Can we turn Mars into Earth?

Can we build a warp drive?

When will the sun burn out?

Why do we ask questions?