1
00:00:00,001 --> 00:00:06,680
"Hubble's Inside the Image: Abell 2744"

2
00:00:06,680 --> 00:00:12,680
This is an image of a galaxy cluster called Abell 
2744. It’s in the constellation Sculptor. It's  

3
00:00:12,680 --> 00:00:17,600
also been nicknamed Pandora's Cluster. A bunch 
of galaxies that are all gravitationally bound  

4
00:00:17,600 --> 00:00:23,880
together. So you can see all of these sort of 
yellow fuzzy galaxies here. They're all very  

5
00:00:23,880 --> 00:00:29,080
close to each other. And all of these are sort 
of glued together by their mutual gravity. So,  

6
00:00:29,080 --> 00:00:33,400
the force of gravity is pulling each 
galaxy towards each other galaxy and  

7
00:00:33,400 --> 00:00:37,680
really sticking them together. You can kind of 
think of these like almost cities of galaxies,  

8
00:00:37,680 --> 00:00:44,240
since there are so many of them that are living 
in such close proximity. This cluster was observed  

9
00:00:44,240 --> 00:00:50,160
as part of the Hubble Frontier Fields program. 
That program aimed to image six galaxy clusters  

10
00:00:50,160 --> 00:00:56,400
with some of the deepest Hubble observations of 
a galaxy cluster that have ever been taken. These  

11
00:00:56,400 --> 00:01:02,840
are incredibly deep images. These are some of the 
deepest images that we've ever had. Overall, the  

12
00:01:02,840 --> 00:01:08,040
goal was to really sort of understand the deepest 
physics of how these galaxy clusters are acting  

13
00:01:08,040 --> 00:01:12,520
as gravitational lenses, uncover what the dark 
matter within these galaxy clusters are doing,  

14
00:01:12,520 --> 00:01:17,080
and then get a really great look at the galaxies 
behind the cluster. So you can see there are a  

15
00:01:17,080 --> 00:01:21,720
lot of galaxies in this image that are sort of 
stretched into these little blue arcs. These are  

16
00:01:21,720 --> 00:01:26,720
all gravitationally lensed galaxies, so they're 
being magnified by the gravity of this massive  

17
00:01:26,720 --> 00:01:31,400
galaxy cluster. And so that gives us a chance 
to see sort of smaller, fainter objects that  

18
00:01:31,400 --> 00:01:37,480
would otherwise be completely invisible without 
the aid of this cosmic telescope. And just like  

19
00:01:37,480 --> 00:01:42,400
a glass lens, it collects a lot more light and 
focuses it back to our telescopes. So we're able  

20
00:01:42,400 --> 00:01:46,680
to see much fainter galaxies than we otherwise 
would be able to without the aid of gravitational  

21
00:01:46,680 --> 00:01:50,680
lensing. This really gives us a huge boost 
at being able to see sort of the smallest,  

22
00:01:50,680 --> 00:01:56,760
faintest objects in the distant universe. 
With this particular galaxy cluster,  

23
00:01:56,760 --> 00:02:01,840
you're able to see galaxies that are as far back 
as about 12 billion years ago. So we're really  

24
00:02:01,840 --> 00:02:06,680
pushing back to sort of the early days of the 
universe. Overall, the age of the universe now  

25
00:02:06,680 --> 00:02:12,400
is about 13.8 billion years. So 12 billion 
years is sort of the early stages of when  

26
00:02:12,400 --> 00:02:14,410
these galaxies would have been forming. 

27
00:02:14,410 --> 00:02:21,793
Abell 2744 

28
00:02:21,793 --> 00:02:28,439
"Follow us on social media @NASAHubble"