NEIL deGRASSE TYSON.

THE LAST TIME WE WERE OF YOU WER HERE WE DID A FLIP AND YOU

ASKED ME SOME QUESTIONS.

>> I SAT IN YOUR CHAIR.

>> Stephen: YOU DID.

I'LL ASK YOU A QUESTION YOU ASKED ME.

I'LL FLIP THE SCRIPT.

"NEIL deGRASSE TYSON WHAT, ARE YOU MOST WORRIED ABOUT IN THE

NEXT CENTURY?" >> OKAY.

I HAVE A LITTLE BIT OF A COP-OUT ANSWER IF YOU WILL ALLOW IT.

YOU DON'T LOOK LIKE YOU'RE ALLOWING IT.

I STUDY THE HISTORY OF THE WORLD OFTEN, AND I LOOKED BACK IN THE

YEAR 1900.

THEY GAVE A LIST OF THINGS PEOPLE WERE MOST CONCERNED ABOUT

AND IT WAS, LIKE, TUBERCULOSIS, LIKE, IS THERE ENOUGH FOOD TO

FEED THE GROWING POPULATION?

THOSE WERE BIG CONCERNS BACK THEN.

THEY DIDN'T ABOUT ASTROADSIDE, THAT THEY CAN RENDER YOU AND I

THINK.

WHAT DO WE WORRY ABOUT IN THE YEAR 2000?

ASTEROIDS THAT CAN RENDER YOU AND I THINK?

WE'RE WORRIED ABOUT Y2K.

WE'RE WORRIED ABOUT A.I.

ARE THEY GOING TO MAKE US THEIR PETS WHEN --

>> Stephen: GOD, I HOPE SO.

I'M TIRED OF MAKING DECISIONS.

>> YOU BETTER HOPE THEY ONLY MAKE US THEIR PETS BECAUSE THAT

MEANS THEY MIGHT EVEN TAKE CARE OF US.

OTHERWISE THEY MIGHT JUDGE THEY WOO ARE A SCOURGE ON THE EARTH'S

SURFACE AND, THEREFORE, SHOULD BE EXTINGUISHED.

IF THE ENTIRE LIST OF WHAT PEOPLE ARE WORRIED ABOUT NOW IS

DIFFERENT FOM THE YEAR 1900, WHAT I FEAR THE MOST IN 2100 IS

THE STUFF WE HAVEN'T FIGURED OUT YET THAT WILL COMPOSE AN

EXISTENTIAL RISK TO US.

>> Stephen: YOU FEAR NOT KNOWING WHAT TO FEAR.

WOW.

THAT'S TERRIFYING.

( APPLAUSE ) OKAY, NEIL, YOU'RE KNOWN FOR

HAVING OPINIONS ABOUT A LOT OF THINGS SO I JUST WANT TO GET

INTO SOMETHING HERE-- >> POINTS OF VIEW.

>> Stephen: WHAT'S THE DIFFERENCE BETWEEN AN OPINION

AND A POINT OF VIEW?

>> THE POINT OF VIEW CAN BE COMPLETELY ACCURATE WHETHER OR

NOT YOU LIKE IT.

WHEREAS YOU CAN HAVE AN OPI OPINION,.

>> Stephen: THAT IS ONLY YOUR OPINION.

YOU ALSO WEIGH IN ON MOVIES A FAIR AMOUNT.

>> HOW DID YOU GET THAT-- WHAT DID YOU DO BACK HERE?

>> Stephen: I GOT THESE RIGHT HERE.

I GOT THESE RIGHT HERE.

THIS ONE, YOU SAID ABOUT THE FILM "ED ASTRA."

YOU SAID: ( LAUGHTER )

YOU DON'T SEE ANY REASON TO BE A MOON PIRATE?

THERE HAS GOT TO BE MONEY UP THERE.

THEY'RE MINING ASTEROIDS, MAN?

>> IT'S EXPENSIVE.

PIRATES DON'T HAVE THAT MUCH DISPOSABLE INCOME, I DON'T

THINK.

OH, GOSH.

>> Stephen: THIS ONE GOT A LOT OF PEOPLE--

>> OH, GOSH.

>> Stephen: ...SCRATCHING THEIR HEADS AND SHAKING THEIR

FISTS AT YOU.

I'M NOT SURE WHAT MOTIVATED THIS ONE.

I'M NOT SURE WHAT MOTIVATED THIS ONE.

( LAUGHTER ) ( APPLAUSE )

AND THE NATURAL QUESTION IS, "WHY ARE YOU SAYIN'?"

>> I'M JUST SAYIN'.

SO, FIRST OF ALL, -- >> Stephen: ARE YOU WORRIED

ABOUT HER.

>> LET ME MAKE THAT CLEAR, THAT'S NOT AN OPINION.

I MEASURED THE SIZE OF HER HEAD.

I MEASURED HER EYEBALLS.

THOSE ARE MEASUREMENTS.

I DIDN'T JUST PULL THAT OUT OF ETHER.

>> Stephen: THAT'S SCIENCE.

>> THAT'S SCIENCE.

IT'S NOT AN OPINION.

YOU DON'T HAVE TO LIKE MY SCIENCE, BUT THAT DOESN'T MAKE

IT WRONG BECAUSE YOU DIDN'T LIKE IT.

( LAUGHTER ) >> Stephen: NEIL, THE NICE

THING-- THE NICE THING ABOUT TALKING TO YOU IS YOU ALWAYS

OPEN MY EYES TO PERSPECTIVES AND IDEAS I DIDN'T KNOW I CARED

ABOUT.

( LAUGHTER ) AND NOW I DO.

WONDERFUL TO SEE YOU.

WONDERFUL TO SEE YOU, NEIL.

THERE YOU GO.

"COSMOS: POSSIBLE WORLDS" AIRS MONDAYS ON NATIONAL GEOGRAPHIC.

NEIL deGRASSE TYSON, EVERYBODY!

WE'LL BE RIGHT BACK.