# Time travel through black holes

Lets briefly focus on Einsteins theory of relativity (time dilation with gravity )-

Einsteins theory states that time is slowed when gravity increases.
I know this sounds wierd and confusing but lets understand it gradually.
Lets understand why time slows with Gravity.
You just need to remember that the universe has 4 dimensions. The 3D space and the 4th dimension is time!

Now consider the Earth. Imagine two points at the ends of its Diameter! The light will have to travel a distance around the circumference of Earth to reach from point A to Point B.
Now suppose the Earth was absent! Then the light would travel in a straigth line from A to B. This means that the presence of Gravity has caused a distraction in the 4 dimensions i.e; it is bending the space-time(or the 4 dimensions). Since the space is getting bent due to gravity(i.e; The path from point A to point B is bent due to presence of Earth) The fourth dimension time( which is definitely not an independent dimension according to theory of relativity) is also being elongated or slowed. Hence  time slows near gravity.

Close to bodies such as Sun or Earth which have relatively smaller mass ,such effects (time dilation effects) are generally too small to be noticed and can be ignored!

However when we speak about black holes that are of billions times mass of sun.. time dilation effect cannot be ignored!

Black holes have an event horizon. We know nothing can escape black holes.
However since black holes dont have a defined surface-we define its event horizon(similar to surace of balck hole).
It is the region surrounding black hole in which once an object just enters- then- its escape is impossble! ( you can call it as the critical region!)

Black holes have accelration  due to gravity that shows different variation than planets! Like we know-for the Earth-how it varies with depth and altitude -this is because earth has a surface.
However black holes dont have a surface. They are like high mass filled in a point!!! Hence we cant define its surface but we define its area of influence and event horizon of black hole is that region where its influence just begins!

For supermassive blackholes once you are on the event horizon of black hole there is a possibility you will escape because the acceleration due to gravity shows exponential behaviour with distance from black hole.. and a mere escape is possible which is not possible incase of small black holes.

So imagine you standing in free space at a safe distance from blackhole!
your friend on the other hand is with you.
Now he starts moving towards the black hole.

And reaches close to its event horizon!
As soon as he reaches the event horizon. Time has slowed tremendously for him.
The time dilation is too strong near black hole.
Suppose he spends few seconds in the event horizon of black hole before escaping it (escape is difficult ). We know time for him is slow there .

that is if for his friend it shows 1 hr have passed the guys(at the event horizon ) clock show’s that less than 1 hr has passed(due to high mass of black hole the clock is ticking very slow and 1hr for his friend may correspond to even 1 second for guy at the event horizon ). That is after few seconds the guy at the black hole may become younger than he would have if he was with his friend far from it.
the guy has relativisticly travelled in past by getting younger !!

You may think then why astronauts on space stations are not affected this as they spend 1 year around Earth.
they are indeed affected!

The effect is hardly noticable…

As the earth has small mass!

Posted Under

## 30 thoughts on “Time travel through black holes”

1. Good day! Would you mind if I share your blog with my facebook group? There’s a lot of folks that I think would really appreciate your content. Please let me know. Cheers

2. I like reading through an article that can make men and
women think. Also, thank you for allowing for me to comment!

3. Hi there, i read your blog occasionally and i own a similar one and i was just curious if you get a
lot of spam responses? If so how do you protect against it, any plugin or anything you can recommend?
I get so much lately it’s driving me mad so any assistance is
very much appreciated.

4. I just like the helpful info you provide in your articles. I’ll bookmark your blog and take
a look at again here regularly. I’m moderately certain I’ll be informed lots of new stuff right here!
Best of luck for the next!

5. You really make it seem so easy along with your presentation however I to find this topic to be actually one thing which I believe I’d never understand.
It sort of feels too complicated and extremely wide for me.
I am looking ahead for your next put up, I’ll attempt to
get the hang of it!

6. My relatives every time say that I am killing my time
here at web, except I know I am getting know-how daily by reading thes pleasant
content.

7. I think the admin of this website is genuinely working hard in favor
of his web page, because here every information is quality based material.

8. I know this website presents quality depending posts and additional stuff, is there any other web site
which presents these kinds of data in quality?

9. Greetings from Ohio! I’m bored at work so I decided to check out your website on my iphone during lunch break.

I enjoy the information you present here and can’t wait to take a
look when I get home. I’m surprised at how fast your blog loaded on my cell phone ..

I’m not even using WIFI, just 3G .. Anyhow, amazing site!

10. I really like what you guys are up too. This type of clever work and coverage!
Keep up the good works guys I’ve included you guys to our blogroll.

11. Appreciation to my father who told me regarding this webpage, this
web site is genuinely amazing.

12. Hello there! I could have sworn I’ve visited this site before
but after going through many of the articles I realized it’s
new to me. Anyhow, I’m certainly happy I came across it
and I’ll be book-marking it and checking back often!

13. magnificent submit, very informative. I’m wondering why the other specialists of this sector do not realize this.
You should continue your writing. I’m confident, you have a huge readers’

14. Do you have a spam issue on this blog; I also am a blogger, and I was wanting to know your situation;
many of us have developed some nice procedures and we are looking to exchange solutions with other
folks, why not shoot me an email if interested.

15. a says:

Wow, awesome blog layout! How long have you been running a blog for?
you made blogging glance easy. The whole look of your website is excellent, as neatly as the content!

16. Aw, this was a very good post. Taking the time and actual effort to create a superb article… but
what can I say… I put things off a whole lot and never manage to get anything
done.

17. Hey there would you mind sharing which blog platform you’re working with?
I’m planning to start my own blog in the near future but I’m having a tough time choosing between BlogEngine/Wordpress/B2evolution and Drupal.
The reason I ask is because your layout seems different then most blogs and I’m looking for something unique.

18. It’s in fact very difficult in this active life to listen news on Television, so I simply use internet for that reason, and
get the most up-to-date information.

19. Hi there, I discovered your website by way of Google whilst searching
for a similar matter, your site came up, it looks good.
I’ve bookmarked it in my google bookmarks.
Hello there, just become aware of your blog thru
Google, and found that it is really informative. I’m gonna be careful for brussels.
I will be grateful if you happen to continue this in future.
A lot of other people will be benefited out of your writing.

Cheers!

20. Your means of describing the whole thing in this paragraph is
in fact fastidious, all be able to effortlessly understand it, Thanks a lot.

21. You’re so cool! I don’t believe I’ve read through
something like that before. So great to find another person with original thoughts on this subject.

Seriously.. many thanks for starting this up. This web site is one
thing that’s needed on the internet, someone with a bit of originality!

22. I all the time emailed this web site post page to all my
contacts, as if like to read it then my contacts will too.

23. I am curious to find out what blog platform you happen to
be using? I’m having some minor security problems with my latest website and
I would like to find something more secure. Do you have any recommendations?

24. Thanks in favor of sharing such a fastidious opinion, article is good, thats why i have read it fully

25. Thanks in favor of sharing such a pleasant opinion,
paragraph is nice, thats why i have read it
completely

26. I am extremely impressed with your writing abilities and
also with the format for your blog. Is that this a paid theme or did you modify it your
self? Anyway keep up the nice high quality writing, it’s rare to peer a nice blog like
this one these days..

27. Dog breeds that want to swim include, Labrador Retrievers, Irish Water Spaniel, Spanish Water Dog, Irixh
Setter, Golden Retriever, Chesapeaske Bay Retriever and others.
Compare designs, safety guidelines and prices online for
car seats thqt suit your requirement and often you’re likely
to locate a good deal online. In addition towards
the aforementioned tips about tips on how to look after your automobile leather, you can even crack
your vehicle windows during summer in order that the heat inside car willl be regulated.