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NASA launched the solar terrestrial relations observatory or stereo spacecraft.
Over the last four years the two spacecraft is slowly made their way along Earth's orbit with -- -- any advancing head and -- -- be following behind.
As the separated our view of the sun has increased.
Other -- near -- -- SoHo and now XTO.
Continue to watch the -- from Earth's perspective -- mysterious spacecraft's heat increasingly differently.
Now here you -- are almost exactly opposite each other.
And for the first time in human history we have a view of the entire side.
The -- has a huge influence on every -- life.
And with our increased reliance on technology just influenced just keeps getting stronger.
Critical mass ejection solar flares -- the hurricanes of space weather and they have the power to disrupt our navigation systems communications and even electrical grids so it's vital we know when they're coming.
-- protecting our homes requires the best possible weather forecast protecting these systems requires the best possible space weather forecast.
Sunspots and other active regions on the sun can help predict a new round of such space weather but the -- stereo we were able to see only one side of the -- at a time.
We couldn't tell what was starting to form on the far side.
Since the sun takes about 2072 -- wants solar activity.
He had plenty of time to build unnoticed.
I just first begin to get a sense of -- farsightedness -- -- Michelson doppler imager.
Which worked almost like an ultrasound to give a few episodes back based -- observations of the ripples on its front.
Now stereo can make direct observations and eliminate any uncertainty about activity on the -- -- -- side.
This unprecedented view will last for at least another eight years has the spacecraft slowly continued injured.
-- cross behind the side and then once again continue to opposite sides of the sun this time with their positions reversed.
During that time astronomers will be able to see magnetic active regions where everything form on the side so we -- know about regions on the far side it will before any earth based observatory conceit.
The -- you sound from stereo industry you know coupled with the other spacecraft NASA's senior physics.
We'll help scientists understand -- dynamic star gets more time to prepare for the next big story.
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