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foreign

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[Music]

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four is what's called an emission nebula

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it has this bright glowing gases that

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you see here it's in What's called the

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large magellanic cloud

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this image is about a thousand light

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years across so it's a fairly large

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nebula this Dark Void in the center is

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about 250 light years across and that is

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something called a Super Bubble area in

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the nebula it's been completely cleared

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out all around it we have dust and gas

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at various temperatures various

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densities inside of that bubble we only

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have what's called ionized gas it's very

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hot gas

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one of the puzzles in this image or

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competing ideas and they're probably

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both

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contributing here neither one seems to

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be the ultimate solution one is that the

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Winds of stars inside the void which

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include high energy high speed particles

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coming out from the surface of the Stars

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pushing material clearing it out of the

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center the other possibility or the

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other thing that's probably contributing

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to the clearing of this Super Bubble is

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supernova

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they're massive stars explode which

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sends out both particles and radiation

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these particle waves that are coming out

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can act as a snow plow and basically

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clear out the the void and push it up

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against this outer Ridge that we see

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here if these are happening you should

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see around this border stars in the

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process of formation and in fact we do

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see stars there and there are about five

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million years different in age than the

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stars that are inside they have formed

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later after this compression has

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happened from the clearing of the inside

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it is still expanding not not super fast

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it appears that the near Edge is coming

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toward us at about 45 kilometers per

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second the far Edge is receding at maybe

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30. so it's asymmetric which is

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interesting it's moving a little faster

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on one side than the other it's called

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the Super Bubble because of its size if

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we go to smaller and smaller bubbles

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they become more and more frequent to

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see a volume of space this large that

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has been cleared out so completely is