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Fla Dem

(23,650 posts)
Thu Nov 14, 2019, 11:48 AM Nov 2019

"Dinosaurs roamed the Earth on the other side of the Milky Way galaxy"

I'm always fascinated with articles about the universe, about how old the universe is, how old our Milky Way galaxy is and how we all fit into the universe. Not that I always understand what they say, but I'm just amazed our Earth is a little pin prick in the whole universe and even our galaxy. That Earth has existed 4.5 billion years, while humans have existed for only 3.5 - 4 million years. It puts into perspective sometimes how insignificant we all are in the total scheme of things. That while we are on this earth for such a short time we really should be focused on making life better for all and protecting our planet.

Anyway given that background, you can understand why I might be interested in an article titled.....

Earth was on the other side of the galaxy when dinosaurs reigned

By Ashley Strickland, CNN 8 hrs ago

Apart from the asteroid that wiped out the dinosaurs 65 million years ago, there aren't many connections between space and dinosaurs outside of the imagination. But that all changed when NASA research scientist Jessie Christiansen brought the two together in an animation on social media this month.

For the past decade, Christiansen has studied planet occurrence rates, or how often and what kinds of planets occur in the galaxy, while studying data from exoplanet hunters such as NASA's Kepler, K2 and TESS missions.

During a stargazing party at the California Institute of Technology, Christiansen was explaining how young the stars were that they observed. The skywatchers were looking at the Pleiades, a bright young cluster of stars that are some of the youngest in our sky.

They're 13 million years old, which sounds ancient. Christiansen wanted to convey that astronomically, that's still a young age.

She told her fellow stargazers that before they went extinct, dinosaurs wouldn't have even seen these stars in the sky because they didn't exist until millions of years after the extinction event. And she told them that when dinosaurs such as stegosaurs roamed the Earth, our entire solar neighborhood was on the opposite of the Milky Way galaxy that it is now.

More>>>>>
https://www.msn.com/en-us/news/technology/earth-was-on-the-other-side-of-the-galaxy-when-dinosaurs-reigned/ar-BBWIg4V?li=BBnbcA1



A NASA scientist's incredible animation shows how dinosaurs roamed the Earth on the other side of the Milky
Way galaxy

https://www.businessinsider.com/video-nasa-scientist-dinosaurs-milky-way-2019-10


The articles mentions how NASA research scientist Jessie Christiansen developed an animation to visually depict the relationship between our Solar System's trip around the center of the Milky Way Galaxy and dinosaurs.


?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1166773845400801281&ref_url=https%3A%2F%2Fwww.businessinsider.com%2Fvideo-nasa-scientist-dinosaurs-milky-way-2019-10

I follow Dr Christiansen's Twitter feed. She does a great job of explaining things for the lay person.

Just thought you all might find this interesting
23 replies = new reply since forum marked as read
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"Dinosaurs roamed the Earth on the other side of the Milky Way galaxy" (Original Post) Fla Dem Nov 2019 OP
Big K&R. Brilliant! nt tblue37 Nov 2019 #1
I always find this stuff interesting, the scale of Earth, the Solar system and space is astounding Thomas Hurt Nov 2019 #2
Stars we see in the sky may already be gone. Phoenix61 Nov 2019 #3
I know, that's always fascinated me. Plus the fact the universe is expanding. Fla Dem Nov 2019 #7
Yep. Antares or Betelgeuse paleotn Nov 2019 #23
Thank you for that post and link. PoindexterOglethorpe Nov 2019 #4
Yes, I've read that. If, and that's a big if, there is any life on earth Fla Dem Nov 2019 #8
No. This planet will not wind up outside any galaxy. PoindexterOglethorpe Nov 2019 #9
Thank you for the clarification.That makes sense. Fla Dem Nov 2019 #10
Glad to be helpful. PoindexterOglethorpe Nov 2019 #11
Good stuff - Thanks for posting packman Nov 2019 #5
With me, the terms "person" and "dinosaur" are interchangeable DFW Nov 2019 #6
So that's why dinosaurs are having such a problem getting their mail forwarded. CaptainTruth Nov 2019 #12
Always something to learn about our galaxy. JohnnyRingo Nov 2019 #13
Dinosaurs are still dangerous. keithbvadu2 Nov 2019 #14
Wish upon a falling star keithbvadu2 Nov 2019 #15
Mind blowing...who would've thought!!!! Karadeniz Nov 2019 #16
Fascinating!! LeftInTX Nov 2019 #17
Cue "Galaxy Song", by Monty Python sl8 Nov 2019 #18
Very interesting, Thanks for posting. MatthewHatesTrump2 Nov 2019 #19
K&R nt flying rabbit Nov 2019 #20
The continents were different, too Leith Nov 2019 #21
Modern humans are much younger Boomer Nov 2019 #22

Thomas Hurt

(13,903 posts)
2. I always find this stuff interesting, the scale of Earth, the Solar system and space is astounding
Thu Nov 14, 2019, 12:03 PM
Nov 2019

we have a hard time wrapping our heads around it due to our terrestrial existence. Best we can do is put it in perspective we grasp.

Example: If the Sun is a meter and half in diameter, Earth is the size of marble and the diameter of the solar system to Neptune is roughly 7 miles.

Phoenix61

(17,002 posts)
3. Stars we see in the sky may already be gone.
Thu Nov 14, 2019, 12:19 PM
Nov 2019

We could be seeing light that started its journey to us tens of thousands of years ago. How trippy is that?

Fla Dem

(23,650 posts)
7. I know, that's always fascinated me. Plus the fact the universe is expanding.
Thu Nov 14, 2019, 02:36 PM
Nov 2019

So I always wonder, when we see pictures taken by the Hubble Telescope of far off galaxies, do they still exit? Or when they show the birth of a star, how many millions of years ago did that actually take place. So many questions.

This video of the birth of a star, but a million years old.

paleotn

(17,911 posts)
23. Yep. Antares or Betelgeuse
Sat Nov 16, 2019, 10:55 PM
Nov 2019

may supernova tonight...or already went supernova centuries ago and we just haven't seen it yet. Weird stuff.

PoindexterOglethorpe

(25,848 posts)
4. Thank you for that post and link.
Thu Nov 14, 2019, 01:17 PM
Nov 2019

Those who blithely think we've been visited by aliens from somewhere else in our galaxy fail utterly to understand just how vast interstellar spaces really are. Here's something I learned recently may help.

Our galaxy, Milky Way, has about 300 billion (that's billion with a b) stars. Andromeda, the nearest one of any size (some smaller ones are closer) has one trillion stars of so, about three times as many. The two galaxies are on a collision course. Brace yourself and pay attention to property values. Although the initial impact is over 4 billion years away.

Anyway, I recently asked an astronomer friend just how many individual stars will actually crash together when that happens. He said they weren't entirely sure, but probably no more than 10.

Of course many more will interact gravitationally, but actually smash together like flaming car wrecks? An infinitesimally small number.

Here's a cool video of what will happen:



Also, it's obvious that Milky Way has already swallowed up smaller galaxies in the past, and eventually (some 150 billion years from now) all of the galaxies in our local group will have merged, and by that time everything else will be so far away that their light won't reach us. So astronomers in that distant future will have no way of knowing that there is anything outside their own huge galaxy, will have no way of knowing how old the Universe is because the microwave background radiation from the Big Bang will by then be undetectable, and will simply be living in an old and aging portion of an old and aging Universe.

I really do love astronomy and cosmology.

Fla Dem

(23,650 posts)
8. Yes, I've read that. If, and that's a big if, there is any life on earth
Thu Nov 14, 2019, 02:41 PM
Nov 2019

at some point, because of the expansion of the universe, they will see no visible light in the night sky. Well, I know I won't be around to experience that.

PoindexterOglethorpe

(25,848 posts)
9. No. This planet will not wind up outside any galaxy.
Thu Nov 14, 2019, 03:10 PM
Nov 2019

While there are stars out there between galaxies, that's not going to happen to us. Everything in our local cluster will still be visible. It's just that all the other millions upon millions of other galaxies will be so far away light from them will no longer reach us. Our own mega galaxy will have trillions of stars in it, until the eventual heat death of the Universe.

PoindexterOglethorpe

(25,848 posts)
11. Glad to be helpful.
Thu Nov 14, 2019, 03:59 PM
Nov 2019

I love astronomy stuff, and my son is in a PhD program in astronomy on the east coast. He's my go-to guy for all astronomy and cosmology questions.

DFW

(54,349 posts)
6. With me, the terms "person" and "dinosaur" are interchangeable
Thu Nov 14, 2019, 01:39 PM
Nov 2019

I own fossils of animals that used to be my house pets.

LeftInTX

(25,258 posts)
17. Fascinating!!
Thu Nov 14, 2019, 11:25 PM
Nov 2019

Over a period of 100,000 years, constellations are unrecognizable.

Polaris is currently the north star, but in 2500 BC a star that is currently in the bowl of the Little Dipper was the north star.

sl8

(13,736 posts)
18. Cue "Galaxy Song", by Monty Python
Fri Nov 15, 2019, 05:39 PM
Nov 2019


Galaxy Song - Monty Python's The Meaning of Life

Monty Python

Published on Nov 13, 2008

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"It's such a lovely song. I think it's one of the best things Eric [Idle]'s ever done. There was going to be more animation but Terry was so busy with other parts of the film we ended up using more of the live-action parts that I'd shot for safety."

See the full list here - -http://www.montypython.com/news_terry...

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