How We Know The Earth Is Ancient

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PBS Space Time

PBS Space Time

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In astronomy we talk about billions of years like it’s no big deal. But how can we be sure about timescales so far beyond the capacity for human intuition? Our discovery of what we now call deep time is very recent - as recent as our discovery of the true spatial vastness of our universe. And it came as scientists tried to measure the age of the Earth. What they found was as shocking and humbling as anything seen through the telescope.
Hosted by Matt O'Dowd
Written by Dan Falk & Matt O'Dowd
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SwordsmanRyan Hace 6 días
Downvote for your godlessness. You don’t have to agree with religion but you need not say their ideas were just invented. Religion doesn’t tell us what science says, why must science insist what religion says?
Dillon Headley
Dillon Headley Hace 7 días
was my comment deleted...?
Jonathan Metz
Jonathan Metz Hace 8 días
Been watching PBS Spacetime for a good three years now. I love this series, and I particularly admire, Matt, your thoughtful and relatable communication skills. Just want to say something about this episode in particular. I appreciate the way you approached the topic of science and the Book of Genesis. As an evangelical (theologically) who doesn't believe there's any conflict between the claims of Bible and empirical truth, (in a theistic universe all truth must come from the same mind/Creator), it's really frustrating when otherwise objective science communicators essentially do exegesis (who, most likely, aren't learned in Biblical exegesis) and imply that the writers of Genesis or other parts of the Bible were trying to answer the kind of questions that in fact weren’t asked the way we ask them today until the Enlightenment. (e.g. The writers of Judeo-Christian scripture tried to answer material questions about the physics of the universe but science saved us from such anthropocentric thinking and revealed to us the truth.) Thank you for your objectivity.
Curtis Jensen
Curtis Jensen Hace 9 días
So in the end it mainly comes down to radioactive dating? I must ask: are we certain that nothing can make a radioactive isotope decay faster, thus making things appear older than they are?
bulentkulkuloglu Hace 9 días
So the partner is Turkish :)) Bahar is a Turkish female name.
Small and Stressed
Small and Stressed Hace 14 días
Our entire solar system is a bunch of happy accidents. Like neptune and uranus being the true middle children they are having a crucial role in the solar system’s planets as we know them (jupiter is a bully). The 9th planet even taking one for the team when the literal planet embodiment of Zeus exiled it out behind the kuiper belt. Not to mention mercury being the solar system’s punching bag... oof chaos theory be brutal.
Javier Hace 14 días
This channel and its hundreds of thousands of viewers make me cry humbled by the intelligence of some people and the vastness of space time and beyond, and gives me honest hope for humanity.
john piers
john piers Hace 15 días
I think some of these scientific ideas such as determining age may just just be a way to discredit the accuracy of religious books(Bible) since no one is able scientifically prove otherwise.
Jeff Hambleton
Jeff Hambleton Hace 19 días
When was the supernova that created all the heavy elements? Then why was the earth made from this but the sun was mainly hydrogen?
Josh Hace 21 un día
I saw this guy blink once the entire video 😂
Yahsameen Bush
Yahsameen Bush Hace 21 un día
Quick question. If I were to shrink our sun down to a black hole, would the Hawking radiation still keep us warm if it gives off energy with the same information as it was form with? Provided if there is enough quantum form to generate that energy, heat, light, etc.?
Thomas Jamison
Thomas Jamison Hace 22 días
eventually he'll get over his errors of judgment and erroneous statements of fact. Plasma physics had changed all of his assumptions.
Tony Dai
Tony Dai Hace 22 días
7:07 Just a correction, the Earth's surface is much hotter than expected, even when radiation is taken to consideration. This is because the convection currents in the mantle bring up heat from the core.
Craig Spencer
Craig Spencer Hace 23 días
At the end you said the earth orbited the sun 4.5 billion times, which got me thinking; has Earth's orbit decayed around the sun? Has it actually orbited that many times, or possibly more or less due to changing momentum?
ryan c
ryan c Hace 25 días
Thumbs down react only if you're a yec haha
Chakravarthy C
Chakravarthy C Hace 26 días
4.32 billion years younger or older than U. .
Pak De
Pak De Hace 26 días
After 35 years of marriage 4.5 billion years doesn't seem so long.
elijah bullers
elijah bullers Hace 27 días
the big bang never happend though so u cant think of it as anything other than fiction
elijah bullers
elijah bullers Hace 27 días
just about everything he's said about the age of the planet is wrong. sorry bro video's are awesome but ur just...wrong
elijah bullers
elijah bullers Hace 27 días
the earth is over 6'000 years old. u can fight me on that and u will loose
elijah bullers
elijah bullers Hace 27 días
also evaluation is dumb u can fight me on that as well u'll still loose
Doc Lex
Doc Lex Hace 27 días
little a lot less of your face, and more pictures or videos... though you are handsome, i really dont wanna look at your ugly mug all the time every day, and i am sure i am not the only one... thx for understanding
Ed Holohan
Ed Holohan Hace 27 días
We live in a sim.
quibily Hace 27 días
Can anybody recommend a book that could help an adult non-scientist understand the concepts of half-life and carbon dating and stuff like that? I've read explanations of this in a few books, but it's usually over the course of just a chapter or two. I think I need a whole book version of this video, basically. But I'm not motivated enough to read a text book, haha.
Netan Vekaru
Netan Vekaru Hace 28 días
Oct 4004 BC. 😂😂😂
micah blyther
micah blyther Hace 28 días
This is all incorrect. Next thing they are going to say that there is no god. I am only watching this because I do not want to fail my class. But I will still remember that this junk is wrong
micah blyther
micah blyther Hace 15 días
@Dundoril people who don't believe in God
Dundoril Hace 27 días
Well it's hard to say... Which of the thousands of God's men created are you talking about?
Dan X2
Dan X2 Hace 28 días
Featured on Astral Education
Panerai Ferrari
Panerai Ferrari Hace 28 días
But wait ... Answer in Genesis says the world is only 6,000 years old ... I really think you have your facts wrong :)
Grant Jarvis
Grant Jarvis Hace 28 días
Everything I know says earth had a beginning. Any argument is over dating of beginning
Ken Durham
Ken Durham Hace 28 días
But, but, I thought it was only 6,000 years old? That's what these preachers keep saying. I think it's flat now also. Not sure when that happened.
Brooke Gaskin
Brooke Gaskin Hace 28 días
I remember way back when Uranium and Lead dating took real guts cause of all the ignorant narrow minded insecure dummies, always picking themselves up by putting some one else down. You show 'em Uranium and Lead!
Brooke Gaskin
Brooke Gaskin Hace 28 días
A gentleman never asks a lady her age.
Brooke Gaskin
Brooke Gaskin Hace 28 días
we know the earth is ancient cause look how it used to dress in some of those pictures. It used to be a big time hippie, bell bottoms, long hair, that funny smoke smell. Earth is O.G.
Fan Wang
Fan Wang Hace 28 días
Bah this is boring, deep time deep space, took me only 2 mins switch to deep throat.
Sagnik Nath
Sagnik Nath Hace 29 días
wish you could have touched upon the Purana texts in ancient Indian cosmology which actually put the age of every iteration of the universe ("Brahma") at 155 trillion years!! Even Carl Sagan was in awe of this number
Ian Balmer
Ian Balmer Hace 29 días
Atlas shrugged, and he is holding it all up!
Artifact Hunter
Artifact Hunter Hace 29 días
Sorry but you’re confused the earth is young and was created!
micah blyther
micah blyther Hace 28 días
yeh this is all fake
beatyouonce Hace un mes
Could one say that the passage of time is the expansion of the universe? And time delay is caused by matter and energy slowing down that expansion?
Nicholas Williamson
Nicholas Williamson Hace un mes
Panic at tie disco -high hopes :)very nice very nice
Phiphe Dude
Phiphe Dude Hace un mes
The Last
The Last Hace un mes
These are assumptions. They can’t prove it. Remember that. 90% of all scientific theorys have been proven wrong. Over 50% of all ideas that come from universities end up being false. They never seem to mention those facts.
MilitantPacifist Hace 29 días
@The Last how exactly are you going to build a theory without first making assumptions and then comparing the consequences of these assumptions with our reality? Even Newton did so: 1)apple fall on head 2)assume for shits and giggles univeral attraction 3)construct that into formulas 4)make predictions based on formulas 5)compare results to reality assumptions are essential to the scientific method, so I'm not really sure what you mean.
chromium2.0 Hace 29 días
@The Last Assumption - a thing that is accepted as true or as certain to happen, without proof. Theory - a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained. Science is still very much in the business of theories. The only "assumptions" that are made are the things we already know and can all agree are true such as natural laws. But since natural laws have proof to back them up, they're actually not assumptions, by definition.
The Last
The Last Hace 29 días
Science has started making assumptions instead of theories. Know the definition first
MilitantPacifist Hace 29 días
@The Last Because a general practitioner isn't a researcher, same as most engineers aren't involved in research. And yes the scientific method is still being applied just more abstracted as the low hanging fruit of research are gone. Currently modelling, simulations and quantitative or approximative methods have become widely used and accepted, simply due to the power modern computers allow us and the complexity of the fields in study. And once again a simple practical argument applies: Our technology is improving as rapidly and becoming ever more effective and efficient, how would this occur if the sum of our knowledge weren't increasing? In conclusion: Scientific method and Research still very much a thing, just a lot more complicated than in the early 20th century.
chromium2.0 Hace 29 días
@The Last Doctors absolutely use theories. Ever heard of the germ theory of disease? It's the theory that disease is caused by germs and pathogens. It may seem weird to call that a theory since we know it to be true, but the scientific definition of a theory is very different from how it normally used every day. We know that germ theory is true with the same certainty that we know the theory of evolution or the theory of relativity is true.
Dennis White
Dennis White Hace un mes
This planet was billions of years old before it became Earth.
OnHoldAt50 Hace un mes
You lost me on "evolution"- as if that's something that's still real. There's no foundation for proving that a human came from a bird, or anything of anything for that matter. Each DNA is unique to it's own kind. Why has no one ever actually found a "missing link?" Love your videos dude, but I gotta thumb down this one.
Dundoril Hace 27 días
Yes human did not come from birds... Nobody ever said that... Sometimes I wonder why people insist on showing that they have no idea about theories that they think are wrong...
chromium2.0 Hace 29 días
@OnHoldAt50 I'm currently making my way through the Bible. In Exodus right now. I'm actually enjoying it. Much of it is beautifully written. I don't see it as infallible or as the word of God though. That's where we disagree. Perhaps I'll change my mind one day, but extraordinary claims require extraordinary evidence. So it'd take a lot to prove that the Bible is directly inspired by God.
OnHoldAt50 Hace 29 días
@chromium2.0 Seems we're at an impasse then. I dare you to read it in attempt to punch holes. You might change your mind (about the science aspect too. The bible is chocked full of science). There is no cross-over of any species on a molecular level. Each species is it's own. There's no compelling argument to prove that man's intelligence AND consciousness EVOLVED from nothing.
chromium2.0 Hace 29 días
@OnHoldAt50 the Bible is not an authority on science. And even if it was, it couldn't possibly be cited as a source to disprove evolution as it was written several thousand years before modern evolutionary theory was developed, and continues to develop
OnHoldAt50 Hace 29 días
Freedom Anderson Glad someone finally asked. The most infallible source ever. It starts with - In the beginning God created the heavens and the earth. Without getting into the theological aspects, pretty much Moses was spot-on about each kind unto it's own. The guy citing fossils as evidence beyond refute is nuts. It's a Rock! Regardless if you believe God or intelligent design, not species to species. I love the videos this guy does, it blows my mind he went in the evolution direction so quickly.
Gabrielle Warburton
Gabrielle Warburton Hace un mes
You have a great voice to sleep to so thank you a wake up knowing random stuff about time and space which apparently I say in my sleep so everyone gets an education lol
Pat Flat
Pat Flat Hace un mes
I can't help thinking he's like a proportionate Peter Dinklage.
kwamepi1 Hace un mes
Alot of presumptions
MilitantPacifist Hace un mes
assuming that your current understanding of the universe is right until you see a reason to change that assumption is rather reasonable to me.
Fiza Ali
Fiza Ali Hace un mes
Plz can some body answer to my question... is time an illusion? What if there was no time? Whaf if nothing had any motion.
Ronaldo C.
Ronaldo C. Hace un mes
No one really knows how old is earth...we can only estimate.
MilitantPacifist Hace un mes
We've got a few hard upper limits and a few hard lower limits. So we can be very sure that it's younger than the solar system and older than all fossils. and that's just a guess by some dude on the internet.
Sheri Singerling
Sheri Singerling Hace un mes
Woot I actually felt smart watching this Space Time episode for once! Perhaps my PhD in geology came into play 🤔
Jordan Moore
Jordan Moore Hace un mes
"-1/2 pt Watch your SIG. FIGS !" - brilliant!
καμιά ψυχή
καμιά ψυχή Hace un mes
Deep time was not discovered recently... it's been around for eons. HAH
chad moore
chad moore Hace un mes
technically i thought we havent rotated around the sun 4.5 billion times? i thought the planets were in closer orbits in the beginning with greater angular velocity? Like how the moon use to be much much closer. and that it slowly moves out as it rotates slower. its extremely slow process but we are talking billions of years here. I wonder if this made more than a negligible impact on our # of orbits? doubt it but hey
HolyWrath Hace un mes
Okay so you are saying 4.5 billion years, but the real question is how long have we "the human population been here"? "Have we been here that whole time or are we relatively new, and if we are how did we just show up all of a sudden, or did we grow up here over a long process of developing as as species"?
Freedom Anderson
Freedom Anderson Hace un mes
Modern Humans evolved 200,000-300,000 years ago.
Ivan Loredo-Vidal
Ivan Loredo-Vidal Hace un mes
You mention many speculators who got it wrong, and omit the one who got it right: Clair Patterson! Who btw, studied meteorites to get it right and whose lead-free lab ambience was painstaikingly carried out.
Ashton Walters
Ashton Walters Hace un mes
I feel like the word "ideer" is to Americans as "Warshing machine" is other English speaking countries.
Tomasz Sarba
Tomasz Sarba Hace un mes
Marie Skłodowska-Curie [6:41], not Marie Curie.
Delta Daze
Delta Daze Hace un mes
Why do we care what the age of the earth is again???🤷🏻‍♀️
MilitantPacifist Hace un mes
so we understand our home and how it works.
Life is a Trip
Life is a Trip Hace un mes
Question. Elements are made in the stars, how did the Quantum Fields contribute to the making of elements? thanks
polanve Hace un mes
Here is a more detailed video on the subject:
Amigps01 Hace un mes
For a second I was like....wait how do they know so accurately how many times the earth went around the sun??? And then it clicked. Yes I’m an idiot.
Jason Phillips
Jason Phillips Hace un mes
Wait.?. So the almighty darwin was wrong about the age of the earth? Blasphemy!
Stephen Lord
Stephen Lord Hace un mes
More than 4.5 billion years remember we live on Earth 2.0. Earth was here before the collision that created the moon.
Burt1038 Hace un mes
a few billion years old may seem like a long time on human timescales, but it is actually extremely early in the life of the universe. Like, less than .0000001%
Burt1038 Hace un mes
@Layne McCormic No I mean the universe itself is extremely young compared to how long it could last until heat death.
Layne McCormic
Layne McCormic Hace un mes
The universe is about 13.8 billion years old, 4.5 billion years is about 32% of the life of the universe.
Sylvain Rocheleau
Sylvain Rocheleau Hace un mes
Where is your cat?
ronkirk50 Hace un mes
"Deep time" is impossible for me to get my mind around. A thousand years? A hundred thousand years? A million years? A billion years? Those timescales are just incomprehensible for me. One thing I can understand is that it took millions of years of evolution to produce the biosphere and we will have pretty much completely destroyed it in just a few hundred years.
Kaitlyn L
Kaitlyn L Hace un mes
PBS Eons I believe has done a video all about deep time to try and help people get their head around it. It may or may not help you. The Cosmos reboot from a few years back also did, with metaphors of a calendar (if all of history were compressed into one year), right at the beginning of the series. I think Eons' video is about geological time while Cosmos' example is about the universe, though. But various techniques like "if all of time were a year" or a day or just put on a big line can help our brains map our experiences onto this bigger concept.
Verisimilitude Dude
Verisimilitude Dude Hace un mes
Time is relative to the observer.....
Kings Tallington
Kings Tallington Hace un mes
the earth is not "ancient" it still exists. ancient adjective: belonging to the very distant past and NO LONGER IN EXISTENCE!
max5250 Hace un mes
... , or: having been in existence for a very long time.
Micheal Ray
Micheal Ray Hace un mes
Then they'll say the earth is 5 billion years old, then 6, then seven, then 20, then they'll shut up and stop making stupid claims
Dundoril Hace 27 días
No they won't.... One limit is the age of the sun... And the sun is certainly not 20 billion years old.
MilitantPacifist Hace un mes
the beginning of the universe is going to be a hard upper limit so no. and currently we have no indication that earth is older than the current assumptions.
Bill Demich
Bill Demich Hace un mes
Geologists are hilarious.
Lex Raphael
Lex Raphael Hace un mes
Should of just skipped all the biblical stuff, that summary was lacking.
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