U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > Science and Technology > Space
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
Reply Start New Thread
 
Old 05-17-2019, 12:24 AM
 
28,607 posts, read 40,588,688 times
Reputation: 37262

Advertisements

https://www.newsweek.com/huge-hole-r...ky-way-1426920
Reply With Quote Quick reply to this message

 
Old 05-17-2019, 01:19 AM
Status: "Enjoying life..." (set 8 days ago)
 
Location: San Antonio/Houston/Tricity
39,813 posts, read 57,675,314 times
Reputation: 93613
Hmmmmm..... Interesting.
__________________
.
"No Copyrighted Material"
Moderated forums:
World, Europe, Texas, Corpus Christi, El Paso, Lubbock, Tyler, Houston, San Antonio, Tallahassee,
Minnesota, Fish, Home Interior Design and Decorating, Science and Technology Forums
.

Need help? Click on this: >>> ToS, Mod List, Rules & FAQ's, Guide, CD Home page, How to Search
Realtors are welcome here but do see our Realtor Advice to avoid infractions.
Reply With Quote Quick reply to this message
 
Old 05-17-2019, 07:32 AM
 
Location: Somewhere in northern Alabama
18,514 posts, read 55,435,808 times
Reputation: 32216
Avoiding the obvious connection to another astute article on the site; "Grumpy Cat Dies," the idea of a black hole that swallowed a globular cluster, and then happened to cross paths with a galaxy is not a stretch.

"Oh wait... dust on the lens. Nevermind."
Reply With Quote Quick reply to this message
 
Old 05-17-2019, 12:22 PM
 
28,607 posts, read 40,588,688 times
Reputation: 37262
It's unfortunate that the Internet has come to the point that even (so called) respected sites have to stuff click bait crap all over their pages.

Maybe the grumpy cat made the hole on it's way to kitty heaven.
Reply With Quote Quick reply to this message
 
Old 05-17-2019, 01:48 PM
Status: "Enjoying life..." (set 8 days ago)
 
Location: San Antonio/Houston/Tricity
39,813 posts, read 57,675,314 times
Reputation: 93613
Looks like someone noticed it and tried to patch with Photoshop
https://petapixel.com/2019/05/10/sci...ky-way-photos/
__________________
.
"No Copyrighted Material"
Moderated forums:
World, Europe, Texas, Corpus Christi, El Paso, Lubbock, Tyler, Houston, San Antonio, Tallahassee,
Minnesota, Fish, Home Interior Design and Decorating, Science and Technology Forums
.

Need help? Click on this: >>> ToS, Mod List, Rules & FAQ's, Guide, CD Home page, How to Search
Realtors are welcome here but do see our Realtor Advice to avoid infractions.
Reply With Quote Quick reply to this message
 
Old 05-17-2019, 01:49 PM
Status: "Enjoying life..." (set 8 days ago)
 
Location: San Antonio/Houston/Tricity
39,813 posts, read 57,675,314 times
Reputation: 93613
But seriously... did anyone offer any serious explanation? A huge hole doesn't happen overnight...
__________________
.
"No Copyrighted Material"
Moderated forums:
World, Europe, Texas, Corpus Christi, El Paso, Lubbock, Tyler, Houston, San Antonio, Tallahassee,
Minnesota, Fish, Home Interior Design and Decorating, Science and Technology Forums
.

Need help? Click on this: >>> ToS, Mod List, Rules & FAQ's, Guide, CD Home page, How to Search
Realtors are welcome here but do see our Realtor Advice to avoid infractions.
Reply With Quote Quick reply to this message
 
Old 05-17-2019, 02:43 PM
 
22,774 posts, read 17,250,171 times
Reputation: 9481
Quote:
Originally Posted by elnina View Post
But seriously... did anyone offer any serious explanation? A huge hole doesn't happen overnight...
Researchers have offered possible explanations such as a 'bullet' of dark matter that shot through that region of the galaxy, or perhaps a second supermassive black hole in the Milky Way, but that's not likely since such a black hole should show some evidence of its existence. Another possibility is that it was some luminous object with massive gravity that sped though that region of space but can't now be located.

Here's another article on it from Live Science.

https://www.livescience.com/65483-da...rk-matter.html
Reply With Quote Quick reply to this message
 
Old 05-17-2019, 02:56 PM
Status: "Enjoying life..." (set 8 days ago)
 
Location: San Antonio/Houston/Tricity
39,813 posts, read 57,675,314 times
Reputation: 93613
Don't they observe the space and record the observations 24/7
You would think they should notice it the second it happened...
__________________
.
"No Copyrighted Material"
Moderated forums:
World, Europe, Texas, Corpus Christi, El Paso, Lubbock, Tyler, Houston, San Antonio, Tallahassee,
Minnesota, Fish, Home Interior Design and Decorating, Science and Technology Forums
.

Need help? Click on this: >>> ToS, Mod List, Rules & FAQ's, Guide, CD Home page, How to Search
Realtors are welcome here but do see our Realtor Advice to avoid infractions.
Reply With Quote Quick reply to this message
 
Old 05-17-2019, 04:45 PM
 
22,774 posts, read 17,250,171 times
Reputation: 9481
Quote:
Originally Posted by elnina View Post
Don't they observe the space and record the observations 24/7
You would think they should notice it the second it happened...
We can't constantly observe the entirety of the observable universe 24/7. Astronomers have to focus on particular areas they want to observe at a given time. The Gaia space craft which was launched in 2013 to make a 3-D map of the Milky Way apparently recently observed the gap left by the progenitor that caused this 'hole' and Harvard scientist Ana Bonaca noticed a perturbation in the tidal stream she was focusing on. According to the paper I link to below, and if i'm understanding it properly, two different models indicate the event occurred either a.) 500 million years ago (500 myr), or b.) 2.5 billion years ago. (2.5 Gyr). The stars involved are thousands of light years away from us, so this event is not something that recently happened in terms of a human timescale.
Searching for the GD-1 Stream Progenitor in Gaia DR2 with Direct
N-body Simulations
Jeremy J. Webb? & Jo Bovy
Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON, M5S 3H4, Canada

ABSTRACT
We perform a large suite of direct N-body simulations aimed at revealing the location of
the progenitor, or its remnant, of the GD-1 stream. Data from Gaia DR2 reveals the GD-1
stream extends over ≈ 100◦
, allowing us to determine the stream’s leading and trailing ends.
Our models suggest the length of the stream is consistent with a dynamical age of between 2-3
Gyr and the exact length, width and location of the GD-1 stream correspond to the stream’s
progenitor being located between −30◦ < φ1,pro < −45◦
in the standard GD-1 coordinate
system. The model stream density profiles reveal that intact progenitors leave a strong overdensity, recently-dissolved progenitors appear as gaps in the stream as escaped stars continue
to move away from the remnant progenitor’s location, and long-dissolved progenitors leave no
observational signature on the remaining stream. Comparing our models to the GD-1 stream
yields two possible scenarios for its progenitor’s history: a) the progenitor reached dissolution
approximately 500 Myr ago during the cluster’s previous perigalactic pass and is both located
at and responsible for the observed gap at φ1 = −40◦ or b) the progenitor reached dissolution
over 2.5 Gyr ago, the fully-dissolved remnant is at −30◦ < φ1 < −45◦
, and an observational
signature of its location no longer exists. That the dissolved progenitor is in the range −30◦ <
φ1 < −45◦
implies that density fluctuations outside of this range, e.g., a deep gap at φ1 ≈ −20◦
,
are likely produced by compact baryonic or dark-matter perturbers.


Read more: https://arxiv.org/pdf/1811.07022.pdf

Last edited by Mike555; 05-17-2019 at 05:03 PM..
Reply With Quote Quick reply to this message
 
Old 05-17-2019, 05:49 PM
Status: "Enjoying life..." (set 8 days ago)
 
Location: San Antonio/Houston/Tricity
39,813 posts, read 57,675,314 times
Reputation: 93613
Oh, I read the abstract and other info available on the net. Still - there are astronomers (incl. hobby astronomers) that are observing the visible parts of the Space pretty much all the times. They use many different types of telescopes to observe objects in the Universe. Some are located right here on earth and some are sent into space. In fact, a large number of observatories have been launched into orbit.
You would think they have the round of the hour observations covered.

Quote:
According to the paper I link to below, and if i'm understanding it properly, two different models indicate the event occurred either a.) 500 million years ago (500 myr), or b.) 2.5 billion years ago. (2.5 Gyr). The stars involved are thousands of light years away from us, so this event is not something that recently happened in terms of a human timescale.
In other words, this event occurred a very long time ago but was just discovered lately...
The news headlines made it sound like this just happened.
__________________
.
"No Copyrighted Material"
Moderated forums:
World, Europe, Texas, Corpus Christi, El Paso, Lubbock, Tyler, Houston, San Antonio, Tallahassee,
Minnesota, Fish, Home Interior Design and Decorating, Science and Technology Forums
.

Need help? Click on this: >>> ToS, Mod List, Rules & FAQ's, Guide, CD Home page, How to Search
Realtors are welcome here but do see our Realtor Advice to avoid infractions.
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:

Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Science and Technology > Space
Similar Threads
Follow City-Data.com founder on our Forum or

All times are GMT -6. The time now is 09:56 AM.

© 2005-2019, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 - Top