StarTalk Radio

Climate Science! With NASA's Gavin Schmidt

19 Apr 2021

Contributed by Lukas

How do we fix climate change? In this episode, Neil deGrasse Tyson and comic co-host Chuck Nice sit down with Sr. Advisor on Climate Science at NASA, ...

Cosmic Queries – Kitchen Sink Edition

12 Apr 2021

Contributed by Lukas

What are your burning questions about the universe? On this episode, Neil deGrasse Tyson and co-host Chuck Nice answer Patrons’ flaming-hot question...

Hacking the Head & the Heart with Leah Lagos, PhD.

09 Apr 2021

Contributed by Lukas

Can we hack our bodies and our minds? On this episode, Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice talk about how to optimize huma...

The Code of Life and CRISPR with Jennifer Doudna and Walter Isaacson

05 Apr 2021

Contributed by Lukas

Designer babies? On this episode, Neil deGrasse Tyson and Chuck Nice sit down with biographer Walter Isaacson to explore Neil’s interview with Nobel...

Housing Is Health, Housing Is Wealth with Natosha Reid Rice

02 Apr 2021

Contributed by Lukas

Subscribe to SiriusXM Podcasts+ to listen to new episodes of StarTalk Radio ad-free and a whole week early. Start a free trial now on Apple Podcasts o...

The Life and Death of Stars with Jackie Faherty

29 Mar 2021

Contributed by Lukas

Are we really made of stardust? On this episode, Neil deGrasse Tyson and comic co-host Negin Farsad explore the life – and death – of stars with a...

The Right Stuff with Astronaut Scott Kelly and Dr. Chris Mason

26 Mar 2021

Contributed by Lukas

What does it take to be an astronaut? Neil deGrasse Tyson, Gary O’Reilly, and Chuck Nice break down the physical effects of being in space and the r...

Cosmic Queries–Multiverse Madness with Max Tegmark

22 Mar 2021

Contributed by Lukas

Do we live in one of many universes? On this episode of StarTalk, Neil deGrasse Tyson and comic co-host Chuck Nice investigate the theory of the multi...

Cosmic Queries – Life on Exoplanets with Sara Seager

15 Mar 2021

Contributed by Lukas

Is there life on other planets? On this episode of StarTalk, Neil deGrasse Tyson and co-host Matt Kirshen dig into the search for extraterrestrial lif...

Cosmic Queries – Rise of the Machines with Matt Ginsberg

12 Mar 2021

Contributed by Lukas

Can machine learning predict the outcome of basketball games and March Madness? On this episode of StarTalk Sports Edition, Neil deGrasse Tyson, Gary ...

Cosmic Queries – Origins of the Universe, with Janna Levin

08 Mar 2021

Contributed by Lukas

What makes up the universe? On this episode of StarTalk, Neil DeGrasse Tyson and comic co-host Chuck Nice unveil the new StarTalk book, Cosmic Queries...

The COVID-19 Vaccines, with Irwin Redlener

01 Mar 2021

Contributed by Lukas

What’s up with the COVID-19 vaccines? On this episode of StarTalk, Neil deGrasse Tyson and comic co-host Chuck Nice talk about all things COVID-19 v...

The Joy of Techno Science, with Rayvon Fouché

26 Feb 2021

Contributed by Lukas

How is technology changing sports? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice talk with author Rayvon Fouché to explore game-cha...

Improving the News, with Max Tegmark

22 Feb 2021

Contributed by Lukas

How do we improve the news? Neil deGrasse Tyson and comic co-host Chuck Nice talk echo chambers and America’s media problem with Max Tegmark, physic...

Mars Perseverance, with Jim Green, NASA Chief Scientist

15 Feb 2021

Contributed by Lukas

We’re headed back to Mars – Neil deGrasse Tyson and comic co-host Chuck Nice explore NASA’s Perseverance rover and its red planet mission with N...

A Materials World

12 Feb 2021

Contributed by Lukas

It’s a materials world! Neil deGrasse Tyson, co-hosts Chuck Nice and Gary O’Reilly, and Georgia Tech engineer Jud Ready explore how material scien...

Cosmic Queries – Dark Matter, Aliens, End of the Universe

08 Feb 2021

Contributed by Lukas

What is dark matter? Are we alone? How will it all end? Neil deGrasse Tyson and comic co-host Chuck Nice answer fan-submitted Cosmic Queries on topics...

Cosmic Queries – Timekeeping

01 Feb 2021

Contributed by Lukas

What time is it? Neil deGrasse Tyson, comic co-host Chuck Nice, and astronomer and anthropologist Anthony Aveni answer fan-submitted Cosmic Queries ab...

Game-Changing Physics

29 Jan 2021

Contributed by Lukas

How do you change the game? Neil deGrasse Tyson, co-hosts Gary O’Reilly and Chuck Nice, and astrophysicist Charles Liu investigate game-changing tec...

The Science of Happiness, with Laurie Santos

25 Jan 2021

Contributed by Lukas

How do you know you’re happy? How can you be happier? Neil deGrasse Tyson, co-host Negin Farsad, and Laurie Santos, PhD, psychologist and host of Th...

Cosmic Queries – ‘Oumuamua

18 Jan 2021

Contributed by Lukas

Since passing through our solar system in 2017, ‘Oumuamua has been a hot topic of conversation for astronomers. Neil deGrasse Tyson and co-host Chuc...

Pain and Gain, with Lindsey Vonn

15 Jan 2021

Contributed by Lukas

You’re at the top of your game and you get injured. Now what? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice explore injury recover...

Things You Thought You Knew

11 Jan 2021

Contributed by Lukas

There are topics you might think you understand, but, do you really? Neil deGrasse Tyson and comic co-host Chuck Nice investigate the differences betw...

Cosmic Queries – New Year

04 Jan 2021

Contributed by Lukas

Happy 2021! Neil deGrasse Tyson and comic co-host Chuck Nice are looking at the year ahead, reminiscing on the year past, and answering fan-submitted ...

Gambits and Game Theory

01 Jan 2021

Contributed by Lukas

The Queen’s Gambit, game theory, and more – Neil deGrasse Tyson, Gary O’Reilly and Chuck Nice are talkin’ chess with grandmaster Maurice Ashle...

Climate and Diet of Early Humans

28 Dec 2020

Contributed by Lukas

Did early humans eat a paleo diet? Can we learn how to deal with climate change by studying our ancient ancestors? Neil deGrasse Tyson, comic co-host ...

Cosmic Queries – Medieval Science and History

21 Dec 2020

Contributed by Lukas

When you think of Middle Ages, does scientific advancement come to mind? Neil deGrasse Tyson, comic co-host Matt Kirshen, and Seb Falk, Cambridge Hist...

An Exercise in Physics

18 Dec 2020

Contributed by Lukas

What would a quantum stadium look like? Can you race Formula 1 on Mars? Neil deGrasse Tyson, co-hosts Gary O’Reilly and Chuck Nice, and astrophysici...

Cosmic Queries – Fan Grab Bag

14 Dec 2020

Contributed by Lukas

Black holes, the Arecibo Observatory, artificial intelligence, and more – Neil deGrasse Tyson and comic co-host Chuck Nice answer a special batch of...

Cosmic Queries – Science is Cool 4

07 Dec 2020

Contributed by Lukas

Neil deGrasse Tyson and Chuck Nice answer Cosmic Queries about the secrets of the universe, science curriculum, tackling religion in the classroom, an...

What Are the Odds?

04 Dec 2020

Contributed by Lukas

What are the odds your crazy play at the end of the game works? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice investigate the use of...

COVID-19 and the Future of Us

30 Nov 2020

Contributed by Lukas

How does COVID-19 impact children? Neil deGrasse Tyson, co-host Paul Mecurio, and Dr. Irwin Redlener, MD, co-founder of the Children’s Health Fund a...

Cosmic Queries – Fermentation

23 Nov 2020

Contributed by Lukas

Let it sit and watch the science happen: Neil deGrasse Tyson and co-host Chuck Nice answer Cosmic Queries about fermentation with Arielle Johnson, PhD...

Gold Medal Physics, with Edwin Moses

20 Nov 2020

Contributed by Lukas

What does it take to be the greatest of all time? Can you use physics to win gold? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice inv...

Cosmic Queries – Black Hole Survival Guide

16 Nov 2020

Contributed by Lukas

You’ve fallen into a black hole! What do you do? Neil deGrasse Tyson and comic co-host Chuck Nice answer fan-submitted Cosmic Queries about black ho...

StarTalk Live – Climate Science, with Neil deGrasse Tyson

09 Nov 2020

Contributed by Lukas

How can we combat climate change? Neil deGrasse Tyson, comic co-host Chuck Nice, climate scientist Katharine Hayhoe, PhD, and chemist Peter Mahaffy, P...

The Science of the COVID Bubble

06 Nov 2020

Contributed by Lukas

How has COVID-19 impacted athletes? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice investigate with cardiovascular disease specialist...

The Hidden Science of Music, with Eric Whitacre

02 Nov 2020

Contributed by Lukas

Did you know there’s hidden science in music? Neil deGrasse Tyson sits down with Grammy-award winning composer Eric Whitacre, co-host Chuck Nice, ne...

Cosmic Queries – The 2020 Nobel Prize

26 Oct 2020

Contributed by Lukas

Can black holes alter light speed? Is astrophysics the Meryl Streep of the Nobel Prize in Physics? Neil deGrasse Tyson, Chuck Nice, and astrophysicist...

Baseball Physics, with Bill Nye

23 Oct 2020

Contributed by Lukas

Bats, gloves, home runs, and… physics? Neil deGrasse Tyson explores the physics of baseball with Bill Nye the Science Guy, co-host Gary O’Reilly, ...

Cosmic Queries – Proving Einstein Right

19 Oct 2020

Contributed by Lukas

Was Albert Einstein right? Neil deGrasse Tyson, comic co-host Chuck Nice, and theoretical physicist Jim Gates, PhD, investigate general relativity, sp...

Cosmic Crib, with Rainn Wilson

12 Oct 2020

Contributed by Lukas

He’s Dwight from The Office, he’s a climate activist, and he’s definitely a nerd. Neil deGrasse Tyson sits down with Rainn Wilson to explore act...

Hard Hits

09 Oct 2020

Contributed by Lukas

How much force is in a car crash? How much energy is behind a punch? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice investigate hard ...

Cosmic Queries – Cosmic Grab Bag

05 Oct 2020

Contributed by Lukas

Do black holes evaporate? What is dark gravity? Could Superman really rotate the Earth in the opposite direction? Neil deGrasse Tyson and comic co-hos...

Cosmic Queries – COVID-19 Vaccines

28 Sep 2020

Contributed by Lukas

When will there be a COVID-19 vaccine? Is COVID-19 here to stay? How do vaccines work? Neil deGrasse Tyson, comic co-host Paul Mecurio, and vaccine ex...

Building a Virtual World – Drone Racing League

25 Sep 2020

Contributed by Lukas

They’re fun, they’re fast, they’re drones. Neil deGrasse Tyson explores the Drone Racing League with founder and CEO Nicholas Horbaczewski, Mari...

Cosmic Queries – Life on Venus

21 Sep 2020

Contributed by Lukas

Is there life on Venus? Neil deGrasse Tyson, comic co-host Paul Mecurio, and astrobiologist David Grinspoon investigate the recent discovery of phosph...

Cosmic Queries – Interspecies Communication

14 Sep 2020

Contributed by Lukas

Will we ever be able to talk to animals? Neil deGrasse Tyson, comic co-host Chuck Nice, and marine mammal scientist Diana Reiss, PhD, answer fan-submi...

Revolutionizing Tennis, with Nick Kyrgios

11 Sep 2020

Contributed by Lukas

Has tennis gotten too routine? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice investigate the people and technology shaking up the sp...

Cosmic Queries: Lunar Geology

07 Sep 2020

Contributed by Lukas

Why does the Moon have more craters than the Earth? What’s the Moon’s true color? Is the dark side of the Moon real? Could we terraform the Moon? ...

Cosmic Queries – Stargazing

31 Aug 2020

Contributed by Lukas

Has looking up at the stars changed over time? Neil deGrasse Tyson, comic co-host Negin Farsad, and Emily Levesque, PhD, astrophysics professor, and a...

Rebuilding the Human Body

28 Aug 2020

Contributed by Lukas

How do we rebuild athletes after injury? Neil deGrasse Tyson, co-hosts Gary O’Reilly and Chuck Nice, and orthopedic surgeon Dr. Kevin R. Stone, MD, ...

Exploring Grit, with Angela Duckworth

24 Aug 2020

Contributed by Lukas

What is grit? Neil deGrasse Tyson, comic co-host Chuck Nice, and psychologist, author, and world-renowned expert on grit Angela Duckworth, PhD, answer...

Cosmic Queries – Sharks

17 Aug 2020

Contributed by Lukas

To celebrate shark week, Neil deGrasse Tyson, comic co-host Jordan Klepper, and shark scientist Jasmin Graham answer your fan-submitted Cosmic Queries...

Artificial Intelligence and Sports

14 Aug 2020

Contributed by Lukas

Will AI change sports? Has it changed sports already? Neil deGrasse Tyson, co-hosts Gary O’Reilly and Chuck Nice, IBM’s Noah Syken and Second Spec...

Cosmic Queries – Comet NEOWISE

10 Aug 2020

Contributed by Lukas

Neil deGrasse Tyson, comic co-host Negin Farsad, and cosmochemist and author Natalie Starkey, PhD, answer fan-submitted questions about Comet NEOWISE,...

Cosmic Queries – Science Is Cool 3

03 Aug 2020

Contributed by Lukas

Neil deGrasse Tyson and Chuck Nice answer Cosmic Queries about colonizing Mars, promoting science, stimulating curiosity, stargazing, and more for a r...

Making a Phenom – Tech

31 Jul 2020

Contributed by Lukas

To wrap up our “Making a Phenom’ mini-series, Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice explore the ethics of technology in ...

Cosmic Queries – Cosmic Cauldron

27 Jul 2020

Contributed by Lukas

Does dark matter interact with black holes? What’s the best alien in film? Is the universe infinite? On this episode, Neil deGrasse Tyson and comic ...

Cosmic Queries – Volcanoes

20 Jul 2020

Contributed by Lukas

Is the super volcano under Yellowstone going to erupt? What’s the difference between lava and magma? Neil deGrasse Tyson, comic co-host Chuck Nice, ...

Making a Phenom – Nurture

17 Jul 2020

Contributed by Lukas

What does it take to be great? Host Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice explore greatness, grit, and more with Seattle Sea...

Technology and Us, with Ainissa Ramirez

13 Jul 2020

Contributed by Lukas

Do we control technology or does technology control us? Neil deGrasse Tyson, comic co-host Negin Farsad, and material scientist and author Ainissa Ram...

Coronavirus and Conspiracy Theories, with Michael Shermer

06 Jul 2020

Contributed by Lukas

Neil deGrasse Tyson, comic co-host Chuck Nice, and Michael Shermer, author and Founding Publisher of Skeptic Magazine, investigate the rise of conspir...

Making a Phenom: The Mind

03 Jul 2020

Contributed by Lukas

In Episode Two of our ‘Making a Phenom’ mini-series, host Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice investigate the brain of...

Cosmic Queries – Get Some Space

29 Jun 2020

Contributed by Lukas

Neil deGrasse Tyson and comic co-host Chuck Nice answer a grab bag of fan-submitted Cosmic Queries on black holes, dark matter, aliens, colonizing pla...

Cosmic Queries – Algorithms and Data, with Hannah Fry

22 Jun 2020

Contributed by Lukas

What is an algorithm? How do you interpret large amounts of data? Neil deGrasse Tyson and comic co-host Chuck Nice answer fan-submitted Cosmic Queries...

Making a Phenom: Genetics

19 Jun 2020

Contributed by Lukas

In Part One of our Making a Phenom mini-series, Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice explore sports genetics alongside inve...

Cosmic Queries – Science Is Cool

15 Jun 2020

Contributed by Lukas

Neil deGrasse Tyson and comic co-host Chuck Nice answer fan-submitted Cosmic Queries on the educational system, conspiracy theories, the cosmic perspe...

Cosmic Queries – Science to Know

08 Jun 2020

Contributed by Lukas

Neil deGrasse Tyson and comic co-host Chuck Nice answer fan-submitted Cosmic Queries on a variety of topics including life on Mars, the expansion of t...

Coronavirus and Sports

05 Jun 2020

Contributed by Lukas

How has sports been impacted by the COVID-19 pandemic? Neil deGrasse Tyson explores this and more with co-hosts Gary O’Reilly and Chuck Nice, econom...

Cosmic Queries – Alien Oceans

01 Jun 2020

Contributed by Lukas

Is ET hiding in the alien oceans of our solar system? Neil deGrasse Tyson and Jordan Klepper answer Cosmic Queries with Kevin Peter Hand, PhD, astrobi...

COVID-19 and Mental Health

25 May 2020

Contributed by Lukas

Neil deGrasse Tyson explores how the COVID-19 pandemic impacts mental health alongside comic co-host Chuck Nice, neuroscientist Heather Berlin, PhD, a...

Pro Athlete Cosmic Queries

22 May 2020

Contributed by Lukas

Neil deGrasse Tyson, alongside co-hosts Gary O’Reilly and Chuck Nice, answer Cosmic Queries from professional athletes including Olympic skier Linds...

Cosmic Queries – Humans in Space

18 May 2020

Contributed by Lukas

Neil deGrasse Tyson answers fan-submitted Cosmic Queries about manned space exploration with NASA Twin Study principal investigator biologist and gene...

Cosmic Queries – Theoretical Physics

11 May 2020

Contributed by Lukas

Neil deGrasse Tyson, comic co-host Chuck Nice, and astrophysicist Janna Levin, PhD, answer fan-submitted Cosmic Queries on theoretical physics: black ...

Cosmic Queries – Sports Genetics

08 May 2020

Contributed by Lukas

Will genetically-modified humans be the athletes of tomorrow? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice answer your Cosmic Queri...

Cosmic Queries – Cosmic Conundrums

04 May 2020

Contributed by Lukas

Neil deGrasse Tyson and comic co-host Chuck Nice answer fan-submitted Cosmic Queries on black holes, dark matter, the Higgs boson, extraterrestrial li...

COVID-19 Update, with Neil deGrasse Tyson

27 Apr 2020

Contributed by Lukas

Neil deGrasse Tyson and Dr. Irwin Redlener, Director of the National Center for Disaster Preparedness, explore the COVID-19 pandemic including the imp...

Stadiums of the Future

24 Apr 2020

Contributed by Lukas

What do the stadiums of the future look like? Neil deGrasse Tyson, co-hosts Gary O’Reilly and Chuck Nice, and Benjamin Brillat of IBM Sports investi...

Coronavirus and Climate Change, with Neil deGrasse Tyson

20 Apr 2020

Contributed by Lukas

Neil deGrasse Tyson explores coronavirus and climate change with co-host Chuck Nice, Gavin A. Schmidt, PhD, Director of the NASA Goddard Institute for...

Cosmic Queries – Hubble Space Telescope

13 Apr 2020

Contributed by Lukas

It was only supposed to last 3-5 years and it’s been orbiting for 30. Neil deGrasse Tyson celebrates the Hubble Space Telescope's 30th anniversary w...

Wrestling the Pandemic, with WWE’s Xavier Woods

10 Apr 2020

Contributed by Lukas

Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice step into the ring with WWE superstar Xavier Woods to explore professional wrestling, ...

Cosmic Queries – Humans and Robots

06 Apr 2020

Contributed by Lukas

What separates humans from robots? Will humans eventually be fully dependent on automation? Neil deGrasse Tyson, comic co-host Chuck Nice, and robot e...

Science Fiction and Star Trek, with Zachary Quinto

30 Mar 2020

Contributed by Lukas

“The needs of the many outweigh the needs of the few.” Neil deGrasse Tyson explores Star Trek and science fiction with Zachary Quinto (Spock), com...

Unmanned: Drone Racing and Tech

27 Mar 2020

Contributed by Lukas

Is it an Esport? Is it a “real” sport? Or is it a bit of both? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice investigate drone r...

C-3PO and the Rise of Robots, with Anthony Daniels

23 Mar 2020

Contributed by Lukas

What’s the difference between a robot and an android? Should laws protect robots? Neil deGrasse Tyson explores the rise of robots with “I Am C-3PO...

Understanding the Coronavirus (COVID-19)

16 Mar 2020

Contributed by Lukas

Neil deGrasse Tyson and comic co-host Chuck Nice investigate what we currently know about the Coronavirus (COVID-19) with Dr. Irwin Redlener, Director...

The Carlos Beltrán Interview

13 Mar 2020

Contributed by Lukas

Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice sit down with MLB Legend Carlos Beltrán to explore his extraordinary career including...

Cosmic Queries: Until the End of Time, with Brian Greene

09 Mar 2020

Contributed by Lukas

Neil deGrasse Tyson, comic co-host Chuck Nice, and theoretical physicist and author Brian Greene answer questions from our fans about string theory, t...

Cosmic Queries – Black Holes and Dark Energy Part II

02 Mar 2020

Contributed by Lukas

One episode wasn’t enough! Neil deGrasse Tyson and comic co-host Chuck Nice are back to answer more fan-submitted questions about black holes, dark...

Show Me the Money: Is it College Athlete Payday?

28 Feb 2020

Contributed by Lukas

Should college athletes be getting paid? Neil deGrasse Tyson and co-hosts Gary O’Reilly and Chuck Nice investigate this hotly debated question along...

Cosmic Queries – Black Holes and Dark Energy

24 Feb 2020

Contributed by Lukas

Could the Earth become a black hole? Does dark energy impact your life? Neil deGrasse Tyson and comic co-host Chuck Nice answer your fan-submitted que...

Geekdom 101, with Olivia Munn

17 Feb 2020

Contributed by Lukas

Are you ready for your lesson in geek culture? Neil deGrasse Tyson chats with Olivia Munn about superheroes, aliens, math, planetary science, and more...

Cosmic Queries – The Joy of Tech

14 Feb 2020

Contributed by Lukas

Neil deGrasse Tyson, co-hosts Chuck Nice and Gary O’Reilly, and Angela Ruggiero, Olympic Gold Medalist and CEO of Sports Innovation Lab, answer your...

Live at Awesome Con – To Mars and Beyond

10 Feb 2020

Contributed by Lukas

We explore the mission to Mars and beyond with Bill Nye the Science Guy, co-host Eugene Mirman, astrobiologist David Grinspoon, former NASA Deputy Adm...

Cosmic Queries: Space Probes with Dr. Amy Mainzer

08 Feb 2020

Contributed by Lukas

JPL astrophysicist Dr. Amy Mainzer is back as guest host for this week’s podcast, and together with comic co-host Chuck Nice she answers your questi...

Quirky Cosmic Queries

03 Feb 2020

Contributed by Lukas

Aliens, the multiverse, immortality, ʻOumuamua, and more – Neil deGrasse Tyson and comic co-host Paul Mecurio answer the quirkiest fan-submitted Co...

Conquering the Game, with Tony Gonzalez

31 Jan 2020

Contributed by Lukas

As we gear up for Super Bowl LIV, Neil deGrasse Tyson sits down with NFL legend Tony Gonzalez to explore his football career, quantum mechanics, vegan...

Cosmic Queries – Navigating the Cosmos

27 Jan 2020

Contributed by Lukas

Neil deGrasse Tyson and comic co-host Harrison Greenbaum answer fan-submitted Cosmic Queries that explore the techniques, inventions, and ideas for na...

Cosmic Queries – The Deep Part II

20 Jan 2020

Contributed by Lukas

Time to get even deeper! Neil deGrasse Tyson and comic co-host Chuck Nice answer fan-submitted questions on the multiverse, the Big Bang, time travel,...