This
Hubble Space Telescope image shows the farthest galaxy yet seen in an
image that has been stretched and amplified by a phenomenon called
gravitational lensing. The embryonic galaxy, named SPT0615-JD, existed
when the universe was just 500 million years old. Though a few other
primitive galaxies have been seen at this early epoch, they have
essentially all looked like red dots, given their small size and
tremendous distances. However, in this case, the gravitational field of a
massive foreground galaxy cluster, called SPT-CL J0615-5746, not only
amplified the light from the background galaxy but also smeared the
image of it into an arc (about 2 arcseconds long). Image analysis shows
that the galaxy weighs in at no more than 3 billion solar masses
(roughly 1/100th the mass of our fully grown Milky Way galaxy). It is
less than 2,500 light-years across, half the size of the Small
Magellanic Cloud, a satellite galaxy of our Milky Way. The object is
considered prototypical of young galaxies that emerged during the epoch
shortly after the big bang.
https://photojournal.jpl.nasa.gov/catalog/PIA22079
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