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a super-sized lunar eclipse presented by

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science at nasa

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waking up before sunrise can be tough to

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do

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especially on a weekend

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on saturday december 10th many of us

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will be glad that we did

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a total eclipse of the moon will be

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visible in the early morning skies of

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western northern america

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the action begins around 4 45 a.m

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pacific standard time

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when the red shadow of earth falls

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across the lunar disk

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by 605 am pacific time the moon will be

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fully engulfed in red light

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this event the last total lunar eclipse

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until 2014

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is visible from the pacific side of

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north america

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across the entire pacific ocean to asia

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and eastern europe

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for people in the western united states

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the eclipse is deepest just before local

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dawn face west to see the red moon

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sinking into the horizon as the sun

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rises behind your back

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it's a rare way to begin the day

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not only will the moon be beautifully

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red

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it will also be inflated by the moon

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illusion

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for reasons not fully understood by

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astronomers or psychologists low-hanging

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moons look unnaturally large when they

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beam through trees buildings and other

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foreground objects

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in fact a low moon is no wider than any

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other moon cameras prove it but the

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human brain insists otherwise

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to observers in the western united

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states the eclipse will appear

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supersized

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it might seem puzzling that the moon

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turns red when it enters the shadow of

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the earth

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aren't shadows supposed to be dark

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in this case the delicate layer of dusty

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air surrounding our planet reddens and

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redirects the light of the sun filling

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the dark behind earth with a sunset red

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glow

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the exact hue

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anything from bright orange to blood red

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is possible depends on the unpredictable

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state of the atmosphere at the time of

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the eclipse

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as jack horkheimer of the miami space

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transit planetarium love to say

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only the shadow knows

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atmospheric scientist richard keane of

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the university of colorado might know

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too

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for years he has studied lunar eclipses

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as a means of monitoring conditions in

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earth's upper atmosphere and he has

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become skilled at forecasting these

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events

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i expect this eclipse to be bright red

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with a possible hint of turquoise at the

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edge he predicts

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earth's stratosphere is the key

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during a lunar eclipse most of the light

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illuminating the moon passes through the

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stratosphere where it is reddened by

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scattering he explains

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if the stratosphere is loaded with dust

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from volcanic eruptions the eclipse will

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be dark a clear stratosphere on the

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other hand produces a brighter eclipse

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at the moment the stratosphere is mostly

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clear with little input from recent

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volcanoes

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that explains the brightness of the

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eclipse but what about the hint of

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turquoise

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light passing through the upper

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atmosphere penetrates the ozone layer

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which absorbs red light and actually

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makes the passing light ray bluer

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this can be seen as a soft blue fringe

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around the red core of earth's shadow

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look for the turquoise near the

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beginning of the eclipse when the edge

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of earth's shadow is sweeping across the

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lunar terrain he advises

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a bright red soft turquoise super-sized

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lunar eclipse

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it's coming on saturday december 10th

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wake up and enjoy the show for more news

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about eye-opening events in the night