Neil deGrasse Tyson

I try to best every previous defining moment with a new one. In that way you don't live in the past, you live for the future. -NDTyson

I think it's the multiple attempts of private enterprise to put their money were our dreams are. At that level, success is not as important as acting on the urge to explore. Lest we all ossify in the present. -NDTyson

Metallic hydrogen is not a new idea or concept. It's actually why on the Period Table of Elements Hydrogen typically appears on both the left and right side -- with metals (on the left) and with gases (on the right). In any case, whenever we enter the domain of new element behavior or new molecular properties, it's just a matter of time before new and cool applications follow. So I have no crystal ball, other than to say that in the hands of clever engineers and artists, cool things come from cool scientific discoveries. -NDTyson

Entropy is not the enemy people might be led to believe All it takes is a source of energy to reverse it. Earth is not a closed system. We receive energy daily from the Sun, which empowers the chemistry and life of our planet to grow complexity -- against the wishes of entropy. Consider, however, that the Sun-Earth system, taken together, loses energy and gains entropy. And the entire universe itself is on an one-way trip to entropic oblivion, ending not in fire but in ice, and not with a bang, but with a whimper. Have a nice day. -NDTyson

People worry that entropy will run away with us, reining this ordered world into a disordered mess. Some decades ago, non-physics-fluent religious groups cited the second law of thermodynamics as reason for why Evolution -- where simple organisms evolved complexity over time -- could not be true. When they finally learned that Earth is not a closed system -- open to energy from the Sun -- this argument faded. -NDTyson

Nope. Learn something every day. -NDTyson

I don't mind being misunderstood. It simply raises my educational bar. Educators who are persistently misunderstood should not call themselves educators. -NDTyson

Excellent question. We think life is alive and a slap of iron is not because, among a few other reasons, we have metabolism. We consume energy in the service of our existence. If we find any other entity that does this too, it would make a good candidate for life. Consider also that you reference and "unearthly" element. That is not likely at all because the periodic table of elements is full. There's no room for any other elements to be discovered in the natural universe. And using spectroscopy, we confirm that these very same elements are found in stars across the universe itself. Not only that, the four most common chemically active ingredients in the universe (H, He, O, C, N) are the SAME four most abundant ingredients in life on Earth. So our bias in searching for "life as we know it" is not entirely close-minded. -NDTyson

Science is the most effective thing Humans have ever invented to decode what is real and what is not in the world and the universe. If anybody every comes up with something more effective then we'll be all up in it. The limits, as I see it, are the occasional blind spots that result from looking for something we hope or expect to find, rather than for the unexpected. For this reason, in my field, when we deploy brand new telescopes we try to reserve time for them to enter a kind of serendipity mode, where it looks for anything, rather than what we seek. Big science is also driven by money made available by governments. So when conducted properly, it doesn't affect what is true but what kinds of discoveries of made -- possibly in the service of the state rather than in the service of the individual curiosity of the scientists themselves. -NDTyson

Luuuuuv Comedians. Not a single favorite, but my top eleven, in no order, include: Richard Pryor, Eddie Murphy, Steven Wright, Mitch Hedberg, Amy Schumer, Wanda Sykes, Whoopi Goldberg, Bill Burr, Jerry Seinfeld, Chuck Nice, Eugene Mirman. -NDTyson

Wolf in sheep's clothes. My read of the (entire) plan is to remove Earth monitoring from NASA's mission statement. leaving NASA to think only about the rest of the Universe and not Earth as a part of that same universe. Unless this task is picked up by some other agency, the disconnect will be disastrous to our understanding of our own planet, preventing us from knowing and predicting our own impact on our own environment. My sense is that the next generation (30 and younger) does not think this way. They just don't happen to be old enough to be head of agency, corporations, or government yet. So I look forward to when they are all in charge. Especially anyone born since 1995 -- the year we discovered our first exoplanet. For that reason, I dub that demographic "Generation Exoplanet". -NDTyson

As a middle-school kid: "One Two Three Infinity", by George Gamow and "Mathematics and the Imagination" by Edward Kasner and James Newman. On the fiction side, nothing compares for me to "Gulliver's Travels", by Jonathan Swift. Not the Lilliput story that we all know, but the rest of Gulliver's voyages. That's where most of the deep social commentary is embedded. In later life, I can't get enough of Issac Newton. "Principia", in particular. The most influential book ever on what we call modern civilization. It established the fact that the Universe is knowable and that mathematics is the language it uses to communicate with us. -NDTyson

No. It's quite round actually. But this is true not because I say so. It's true because the methods and tools of inquiry that were hard-earned over the past four centuries, have demonstrated this fact. We call these methods and tools "Science", and one of it's primary utilities is to determine what is true amid what we think is not true, and what is not true in amid what we think is true. -NDTyson

I'm simultaneously one of Space-X's biggest critics and supporters. I've said many time and many places, e.g. http://www.haydenplanetarium.org/tyson/buy/books/space-chronicles that projects that are hugely expensive and dangerous, with uncertain returns on investments make poor activities of profit-driven companies. Governments do these things first, allowing private enterprise to learn what to do and what not to do, then come next with a plan that involves us all. So my read of history is that private companies will not be the first to send humans to Mars unless government actually pays for it. -NDTyson

Embarrassed that I've never seen Rick and Morty. But I'm generally a fan of smart animation. And now that you've called me out, I'll put it on my list. -NDTyson

Lately I've had about one such incident per week. Although my target is one per day. I recently learned from some dynamicist colleagues that the striking visibility of Saturn's ring system is not eternal, coming and going with the dynamical forces of all that orbits the planet. Which means if I were around back when the Dinosaurs roamed and showed them Saturn through a telescope, it might have been an uninteresting sight. Very sad. -NDTyson

yes, i did have a cameo in Zoolander 2. But Ben Stiller made me do it. Especially the end scene, rendering my face as the last thing you see in the film: https://www.youtube.com/watch?v=nu0rFVwX2Ok

But no, we were all (the cameo celebs) choreographed to come on and off set in pre-set timeslots. There was not a single room where we all hung out, waiting to be called. I did overlap with Billy Zane and we've become fast friends.

So my answer to your question is no, I did not get high with Willie Nelson on the set of Zoolander 2. -NDTyson

Can't answer that, but I can give another kind of response -- I think in the next century we will know for sure whether there is or was ever life in the solar system -- especially on all the fun spot that keeps us wondering from afar -- Mars, Europa, Titan, Enceladus. -NDTyson

What matters in society is not how many STEM professionals are running around. What a boring world that would be if we were all scientists and engineers. The world needs poets and artists and actors and comedian, and politicians, and even lawyers. What i see is that if you like STEM, but for whatever reason will not become a STEM professional, you can still gain basic levels of science literacy in your life, and blend that awareness into your work. This is already happening in the Arts. There's no end of art installations, sitcoms, dramas, screenplays, first-run movies, that have been inspired by science. Including The Martian, which helped turn the word "Science" into a verb, and Avatar, the highest grossing film of all time. So if your will not become a scientist yourself, then do not hesitate to allow science to serve as the artist's muse. Next in line -- scientifically literate politicians. -NDTyson

Don't remember the episodes name, but it was when Homer was being drawn into a newly formed black hole, and he utters "I know I should have read that book by that Wheelchair guy". A street sign on that curved spacetime grid also displayed Euler's equation: e^{i pi} = -1. That's when I first discovered that the show has scientists and mathematicians in arm's reach of their creativity. As CBS's "The Big Bang Theory" sitcom has discovered, there's tons of low-hanging fruit in the sciences for creative people to exploit in their storytelling. Not every tv show needs to be about cops, lawyers, or police. -NDTyson

I don't understand this question. Never had Drake on StarTalk. So that means I'm clueless to your meaning. -NDTyson

Don't know. But I'm quite sure that nobody has ever won a championship without enough offense. -NDTyson

I have a cop-out answer to that one. My favorite question to think about is the one we do not yet know to ask because it's very existence awaits our next discovery -- placing us on a new cosmic vista, requiring ideas and inquiry today undreamt of. -NDTyson

I'm born and raised in the Bronx, so I'm a legit Yankee fan. And as I Yankee fan, we're disappointed if we go a decade without a "world" championship.

As for your parents, ask them of they believe other things scientists have told them? That E=mc2 ? That their smart phone talks to GPS satellites, enabling them to avoid traffic enroute to grandma's house? That satellites warn them about weather pattern that could risk life or property?. If they are so skeptical of climate change, would they consider buying real-estate in very low-lying regions of the country, or the world? Do they know that insurance agencies are indeed listening to scientists? If none of that works, offer this short piece that i wrote. It's simply about what science is and how and why it works. Perhaps they never knew that emergent scientific truths are true, whether or not they believe in it. -NDTYson

https://www.facebook.com/notes/neil-degrasse-tyson/what-science-is-and-how-and-why-it-works/10153892230401613

Wow. I wonder how many people that is. Or rather, I wonder what fraction of all people I've met feel that way. (That's surely a more useful datum than the absolute number.) I may be delusional, but I'd guess it's less than 1 in 1000. It think my public persona greatly resembles my private and my one-on-one persona. Anything other than that requires huge investments of energy.

I don't mind being thought of as an asshole if in fact my behavior deserves it. I note that I had just such an encounter with a journalist from Idaho, who write an article titled "Neil deGrasse Tyson is a horse's Astrophysicist". I had actually never met him. And he based everything in his article on things that were objectively false. When I publicly called this to his attention, many of his colleagues and friends mocked him for his sloppy journalism and he ended up leaving his job. So there may be strong urges out there for people to think this way. But I wonder how much of it is based on reality and how much of it derives from people's need to hate.

Another question back at you..how many genuine assholes devote three unsolicited hours to purely answering questions from the public about anything at all? -NDTyson

I really like Earth. So any space trip I take, I'm double checking that there's sufficient funds for me to return. Also, I'm not taking that trip until Elon Musk send his Mother and brings her back alive. Then I'm good for it.

Any demonstration of rocket reusability is a good thing. When we fly on a Boeing 747 across great distances, we don't throw it away and roll out a new one. Reusability is arguably the most fundamental feature of affordable expensive things. -NDTyson

In the USA, education is entirely local -- a surprise to most of the developed world. So a Christian school, or even a public school, could if they wanted to teach anything at all. It's just a matter of voting influence on a school board. If they fear the contents of Cosmos, they simply fear what science tells them about the natural world.

FYI: Galileo (a devout Christian) famously once said: "The Bible tells you how to go to heaven, not how the heaven's go.

So even he saw the line in the sand between the two. But this is 21st century America. And what matters here are the consequences of not teaching science to school children. Innovations in science and technology are the engines of tomorrow health, wealth, and security. So any school district that eschews the discoveries of science has disenfranchised itself from the future of civilization. They can still reap the benefits of it, but they will be paying to obtain (or gain access to) the discoveries of others, and no emergent industries will move their HQ there, if scientifically literate employees are nowhere to be found.

-NDTyson

Trying to get the Band back together on the Cosmos thing. Nothing green-lit yet. But we are all hopeful Lots of pistons need to align. Thanks for that interest.

As for Trump's Executive Orders, sixty million people voted for him. And he won US counties by a landslide. So if he did not do what he promised them (or what we all expected of him) then he would not be serving his electorate. Now, if he passes Executive Orders or if Congress enacts legislation that will disrupt the long-term stability of the country and of the planet, then the problem is not Trump, but your (our) fellow citizens who do not fully understand this problem and need to become informed (as is true for any voter) so that when we elect leaders, there is some correspondence between objective reality and governance. -NDTyson

I'd love me some answers to what Dark Matter is, or Dark energy. I'd also like to know if there is or was ever life on Mars. These are realistically answerable questions in the next couple of decades.

In the immediate several years to come, there's an emerging cottage industry among planet hunters in which we can make measurements of the atmospheric chemistry of exoplanets. These amounts to a search for "bio-markers" such as Oxygen (O2), methane (CH4), and other signs of unstable molecule that could be made by a sustained biosystem on the planet surface. So watch for headlines there in the coming years. -NDTyson

I'd love me some answers to what Dark Matter is, or Dark energy. I'd also like to know if there is or was ever life on Mars. These are realistically answerable questions in the next couple of decades.

In the immediate several years to come, there's an emerging cottage industry among planet hunters in which we can make measurements of the atmospheric chemistry of exoplanets. These amounts to a search for "bio-markers" such as Oxygen (O2), methane (CH4), and other signs of unstable molecule that could be made by a sustained biosystem on the planet surface. So watch for headlines there in the coming years. -NDTyson

No. I think they (we) might all be too far away from one another in space and possibly time. By complex, I'm presuming you mean life other than single-celled organisms. Life with legs, arms, thoughts, etc. It's all about our capacity to travel interstellar distances. And that's surely not happening in the next 50 years. Not the rate things are going today. -NDTyson

Hmm. Maybe a closeup view of a Supernova explosion. One of the greatest events in the universe. Happens maybe only once per century per galaxy. It would look beautiful up close, right up until until the energy intensity vaporized you. -NDTyson

Nothing would make sense. it would also be really hard to explain why different parts of Earth see different parts of the sky at the same time.

We would likely be forced to conclude that the people who asserted that Earth was definitely flat were in fact in denial of emergent scientific truths, and that they had no idea of what a scientific truth actually is. -NDTyson

Francis Bacon is up there. I recently came across a book of his that was filled with accounts of experiments he conducted, which may have informed his important philosophical conclusions about the value of experiment in finding scientific truths. This was around the same time as Galileo, who arrived at the same conclusions. Of course back then, "Natural Philosophy" was practically synonymous with what today we call Physics.

In the 20th centruy, when the atom revealed itself to our experiments, and the expanding universe entered our largest telescopes, it made philosophizing about the natural world harder than before, where now, what's true no longer issues forth from our senses.

Experiments matter. And if you do experiments, we generally call you a scientist and not a philosopher.

Plenty of philosophy frontiers abound, including Moral & Ethical Philosophy, Political Philosophy, Religious Philosophy. And there are still-emergent fields that could benefit from some smart ideas about where they should look next, especially in studies of consciousness, neuroscience, and ecology. -NDTyson

Why should knowing we are indeed small in time, space, and size have anything to do with insignificance. Bacteria surely don't feel that way and they are billions of times smaller than us, yet they do most of our digesting. Ant's surely don't feel that way yet they likely represent nearly 20% of Earth's biomass. Why not instead think of how awesome it is that our 3lbs Human brain matter actually figured all this out. Why not look up to the clear night sky, and reflect on the fact that we don't simply live in this universe, but the universe lives within us -- through the atoms and molecules of our bodies, forged in the hearts of stars that long-ago gave their lives to the galaxy ... and to us. This is, of course, one aspect of the cosmic perspective that perhaps I and my astrophysics colleagues take for granted, but cannot be told often enough. -NDTyson

We are both, last I confirmed, heterosexual. So that won't happen. But I would surely choose him (and not me) as the replacement to the Professor on Gilligan's Island. -NDTyson

To foster an entire generation of scientists as educators so that I can fade away and not even be noticed for having done so. That's would represent a stunning future of science literacy in the land. That's a career goal in the sense that then I can return to the lab and publish research papers again. That's my possibly delusional career goal at this time in my life. -NDTyson

No. But nor am I likely ever to, if a consequence of doing so is that I enter an altered state of consciousness. In my experience, I am not better at solving problems when the chemistry of my brain is anything other than unaltered. -NDTyson

I may be partly guilty for your scientific angst. Most of my public science persona involves conveying the joy of scientific discovery, and especially the joy of curiosity, from childhood through adulthood. What's commonly absent from my messaging is the steep investment of time and energy (physical and emotional) that becoming a scientist and actually doing science requires. In fact the struggle is what must be loved by aspiring scientists because being a practicing scientist requires this of you daily.

Not knowing the answer to a problem and struggling to find the answer is precisely what science is. It's neither more nor less than this. The fact that you are experiencing this very struggle is not a barrier to your progress it is the best evidence that you are on a path where you belong, if you love what you do.

Good luck. Sometimes you need that too.

-NDTyson

6pm. Signing out now. Thanks for all your interest in this AMA. I reached only a fraction of you, but there were some good questions in there. Hoping my answers served this curiosity.

As always, Keep looking up. -NDTyson