article_snippet: NASA science satellites designed to map explosions triggered by .
article_snippet: NASA has launched four identical spacecraft on a billion-dollar mission to study the explosive give-and-take of Earth and sun's magnetic fields .
article_snippet: Each satellite is equipped with 25 sensors to record in .
article_snippet: Data from the four probes .
article_snippet: will be combined to produce three-dimensional maps of the . process.
article_snippet: NASA is spending about $1.1 billion on the project, known as .
article_snippet: The satellites will . fly directly into reconnection zones 44,000 to 95,000 miles above Earth and map what happens when .
article_snippet: The MMS mission will conduct a definitive experiment in .
article_snippet: The MMS mission is designed to last two years.
highlights_snippet: NASA has launched four satellites in a $1.1 billion mission to study the high-speed interactions between Earth's magnetic field and the sun .
  