<p>Holger, </p>

<p>I highly recommend you check out the NASA story on the discovery MACS0647-JD, which includes many dimensional facts (mass, distance, age, etc.) and comparisons:</p>

<p><a href="http://hubblesite.org/newscenter/archive/releases/2012/36/full/" rel="nofollow noreferrer">http://hubblesite.org/newscenter/archive/releases/2012/36/full/</a></p>

<p>From the article: </p>

<blockquote>
  <p>The estimated total mass of the stars in this baby galaxy is roughly
  equal to 100 million or a billion suns, or about 0.1 percent to 1
  percent the mass of our Milky Way's stars.</p>
</blockquote>

<hr>

<p>Measuring the mass of a galaxy is very tricky indeed (especially one as far as 13.3 billion light-years from earth!), but there are a couple different methods that can one can use, see here:</p>

<p><a href="http://www2.astro.psu.edu/~caryl/a480/lecture12_10.pdf" rel="nofollow noreferrer">PSU Astro Measuring Mass of Clusters </a></p>

<p>And this Physics Stackexchange thread as well:</p>

<p><a href="https://physics.stackexchange.com/questions/123/how-does-one-measure-the-mass-of-a-galaxy-and-other-such-large-quantities">https://physics.stackexchange.com/questions/123/how-does-one-measure-the-mass-of-a-galaxy-and-other-such-large-quantities</a></p>

CC BY-SA 3.0
2015-09-07T23:48:58.903Z
2015-09-07T23:48:58.903Z
2017-04-13T12:40:15.377Z
EGreen
<p>To receive light from objects like <a href="https://en.wikipedia.org/wiki/MACS0647-JD" rel="nofollow">MACS0647-JD</a>, I suppose, it has to has extraordinary dimensions and intensity of electromagnetic radiation. What are the mass, the dimensions and other characteristics for this objects?</p>

CC BY-SA 3.0
2015-09-06T17:54:31.683Z
Well, it's a galaxy, for one thing.
HDE 226868
<star>
What do we know about the characteristics of stellar objects, 13,3 billion light years away from us?
HolgerFiedler
# What do we know about the characteristics of stellar objects, 13,3 billion light years away from us?

(Asked by: username_0 on 2015-09-06)

To receive light from objects like [MACS0647-JD](https://en.wikipedia.org/wiki/MACS0647-JD), I suppose, it has to has extraordinary dimensions and intensity of electromagnetic radiation. What are the mass, the dimensions and other characteristics for this objects?

**Tags:** star
> **Comments:**
> **username_1**: Well, it's a galaxy, for one thing.  

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## 1 answers

### Answer by username_2 on 2015-09-07. Score: 2 | Accepted answer

Holger,

I highly recommend you check out the NASA story on the discovery MACS0647-JD, which includes many dimensional facts (mass, distance, age, etc.) and comparisons:

<http://hubblesite.org/newscenter/archive/releases/2012/36/full/>

From the article:

> The estimated total mass of the stars in this baby galaxy is roughly
> equal to 100 million or a billion suns, or about 0.1 percent to 1
> percent the mass of our Milky Way's stars.

---

Measuring the mass of a galaxy is very tricky indeed (especially one as far as 13.3 billion light-years from earth!), but there are a couple different methods that can one can use, see here:

[PSU Astro Measuring Mass of Clusters](http://www2.astro.psu.edu/~caryl/a480/lecture12_10.pdf)

And this Physics Stackexchange thread as well:

<https://physics.stackexchange.com/questions/123/how-does-one-measure-the-mass-of-a-galaxy-and-other-such-large-quantities>


---

