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Looking back in time, ever farther.
In the 1920s, Edwin Hubble observed the expansion
of the universe by observing the motions of far off galaxies.
The Hubble Space Telescope has pushed this boundary
of our understanding further back,
observing even more remote galaxies
and seeing further back in time.
But the Webb Telescope can push still further
to the earliest stages of a galaxy's life.
Like a kid growing up, the early days of a galaxy
is where the most development occurs.
Lots of stars and gas are just beginning
to transform into the full fledged figure
of a mature galaxy.
With Hubble, we can see the universe's awkward teen years
as galaxies grew up, but Webb will
be able to take the childhood photos that
would show us so much more about how the universe began.
The Hubble Space Telescope is currently
pushing the limits of detection as far back in time as it can,
but the Webb Telescope is designed specifically
to find the special time in the early history of the universe.
Equipped with the latest technology,
Webb will allow us to see the objects that brought light
to the cosmos and unravel the mysteries of reionization.
Only then will we have a better idea
of how the universe grew into what we see around us today.
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