B2 中高級 美國腔 750 分類 收藏
Have you ever wondered how big the entire universe is?
The visible universe is unimaginably huge but there
is one image that can give us a small glimpse at its
awe-inspiring scale, and that is the
Hubble Deep Field Image.
[Fanfare jingle]
[Explosion sound and electric guitar riff]
In 1995, astronomers wanted to see what would happen
if they pointed the new Hubble Space Telescope at an
area of the sky that was nearly devoid of all stars.
They let it soak up light for over 140 hours over a
span of 10 days and what they saw was nothing short of spectacular.
This, is the Hubble Deep Field Image. [Orchestral music building]
What you're seeing here is not just a few stars,
nebulas and star clusters but each and every dot
and fuzzy patch you are seeing is an entire galaxy,
each containing around 100 billion stars!
To get an idea of how many stars are in each one of
those galaxies, imagine an Olympic-sized swimming
pool and fill it with standard 1.5cm marbles.
If my calculations are correct (taking into account
the max density of close-packed spheres),
it would fit about 1 billion marbles.
That would mean we'd need 100 Olympic swimming
pools full of marbles to equal the number of stars in an average galaxy!
In a similar, more recent capture called the Hubble
ULTRA Deep Field image, we can see around 10,000
galaxies, each with around 100 billion stars.
Pretty cool right? But you haven't heard the most amazing thing yet!
This image is not the entire night sky - far from it!
This is only a tiny fraction of the sky -
one 13 millionth to be exact!
Look at the size of the D on the front of an
American penny then hold the penny up to the sky at arm's length.
The area of sky that the Ultra Deep Field image takes up
is roughly contained entirely in that tiny "D".
The Hubble Deep Field Images allow us to peer deeper
into space AND time than we have ever seen before.
I say deeper into time because some of these objects
are so far away, the light coming from them has taken
up to 13 billion years to get to us so we're seeing
them as they looked less than a billion years after
the Big Bang, long before the Earth was even formed.
Some of these distant objects are called quasars
which are the most powerful and luminous objects in the universe.
Even though they're only about the size of our solar
system, they emit up to 1000 times more energy than
the ENTIRE Milky Way galaxy, which contains between 200 and 400 billion stars.
They're made up of supermassive black holes that are
consuming so much material, that they shoot giant
jets of particles traveling at nearly the speed of light,
thousands of light years into space!
Yeah, quasars are pretty awesome.
Looking at this image is a humbling experience,
but to me, it just shows how amazing our universe is
and how much there is left for us to explore.
It's almost unfathomable that we could be the only life
in this vast universe.
Peer into this image long enough and you'll start
to imagine what awe-inspiring wonders could be
hiding in those distant galaxies full of billions
of planets. Scientists are learning more about our
universe and our local galaxy every day.
Just imagine what they might find next!
You can download a high resolution copy of the
Hubble Ultra Deep Field image here or on the link
If this is your first time on our channel, I hope
you'll subscribe to catch more of our upcoming
science videos and also check out some of our
educational videos for preschool kids.
Thanks so much for watching, and see you next time!
[If you found these captions useful, I'd love to hear from you in the comments below]


宇宙有多大? (How Big is the Universe? | NASA's Hubble Deep Field Image)

750 分類 收藏
Yassion Liu 發佈於 2016 年 7 月 23 日    Cloudy Wu 翻譯    Mandy Lin 審核
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