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[Music]

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the hubble space telescope is

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an outstanding

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time machine in a sense

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because of course in astronomy anything

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we look at in space we're seeing it as

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it was when the light from that object

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be it a planet a star or a galaxy began

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its journey to us

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now

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normally we don't really think about

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that when we're just looking at the

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night sky

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but it's incredibly important for our

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studies with the hubble space telescope

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to realize that when we're looking at

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a galaxy we're seeing it as it was

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millions of years ago sometimes billions

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of years ago it's taken that long for

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one of the neat things about the hubble

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ultra deep field and one of the things

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that made it so unique was how long it

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took us to take that image there's an

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exposure time that's expressed i think

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it's 11.2 days it's a very very long

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exposure time but probably what's more

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important is how many orbits it took us

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to do that

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400 orbits of hubble data to take that

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image that's a lot of orbits it was a

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lot of hubble time you only get 15

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orbits a day to take 400 orbits and say

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we're going to observe this one spot in

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the sky for 400 orbits and i think the

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results from the science i mean was

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amazing what they saw was spectacular

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we see some of the faintest objects

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showing up in these images and those

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faint objects are often distant galaxies

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these deep fields have revealed visually

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to us

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a universe absolutely teeming with

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galaxies hundreds of billions of

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galaxies in one deep field alone we can

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see

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a thousand of these little smudges of

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light which are distant galaxies by

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doing that we can compare galaxies that

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are shining to us

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from billions of light years away with

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galaxies closer to us or even to our own

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milky way and see if they're similar or

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different

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what hubble has revealed is that the

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universe has in fact changed over these

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billions of years of time

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we looked at the darkest part of the sky

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very small part of that and we were

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amazed at how many galaxies we found and

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we continue to go back to that portion

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of the sky

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to even

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increase that visibility and we've seen

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tens of thousands of galaxies just it's

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amazing

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hubble spent two weeks taking pictures

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of empty places in sky and they saw they

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weren't empty at all they were thousands

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and thousands of galaxies in astronomy

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there's what we knew before hubble and

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now there's what we know after hubble

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they're so different basically every

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page of an astronomy textbook now says

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something about

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discoveries made with hubble every page

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hubble has given us this picture of the

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universe evolving over billions of years

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of time into a place where now we have

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galaxies

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with plenty of stars and interesting

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chemical makeup so this is something

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that

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i'm grateful to the hubble space