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On the list of Bad Stuff That Could Happen, a massive plasma ejection from the sun isn’t an everyday worry, falling somewhere between an irrevocably warming climate and a shortage of soy milk in the office fridge.

Yet our star’s output plays a critical role in space weather, which carries potentially large implications for satellites, mobile phones, airlines and electrical grids — in other words, the underpinnings of 21st-century society. In March 1989, a solar storm that struck Earth zapped the grid in Quebec, Canada, causing most of the province to lose electricity and doing billions of dollars in damage.

Three decades on, a similar solar outburst could do a lot more damage. Even the U.S. National Intelligence Council in 2012 called such an event, if severe enough, one of its “black swans,” along with nuclear war, a global pandemic, collapse of the European Union and U.S. disengagement.

A joint $1.5 billion mission by the European Space Agency and NASA is aimed at expanding our understanding of the sun at a critical time for both space exploration and space commerce. Safely negotiating the solar system — rife with radiation and other highly charged particles — is essential for any long-duration human endeavors in deep space.

Along with protecting vulnerable systems on the ground, a more thorough understanding of space weather may also allow us to better protect flocks of new satellites (not to mention the 2,000 operational satellites already up there) filling up the night skies.

The probability of an extreme solar event striking Earth is akin to a 100-year flood, with a 12% chance over a decade, according to a 2014 research paper by Peter Riley, a co-investigator on the Solar Orbiter mission and senior scientist at Predictive Science Inc.

The National Oceanic and Atmospheric Administration’s Geomagnetic Storm Scale rates such events on a five-level scale, with a G5, or extreme storm, having the capacity to cause electrical grid “collapse or blackouts” and degraded satellite navigation.

For perspective on how expensive such disruptions could be, tallies of the economic cost of the electrical outage in the northeastern U.S. back in August 2003 range as high as $10.3 billion, according to ICF Consulting Services.

As a result, there’s a definite case for protecting against future outages of the sun-made variety. There’s one big problem, however: Enormous scientific mysteries remain about how the sun operates.

“Everything is driven by the sun,” Nicola Fox, director of NASA’s heliophysics division, said at a Jan. 27 news conference. “So we really, really want to understand this star.”

About 4.5 billion years old, the sun is a middle-aged yellow dwarf star. Scientists began paying close attention to its sunspots back in 1755, using 11-year activity cycles that alternate between periods of minimal and maximal sunspot activity. Increased sunspot activity is usually a harbinger of solar flares and coronal mass ejections. These can in turn cause magnetic storms that could affect Earth.

The current cycle, the 24th we’ve measured, has been one of the least active. In December, the U.S. Space Weather Prediction Center, part of NOAA, forecast an average intensity for Cycle 25 that may include about 115 solar storms. Maximum intensity for this cycle is seen occurring around July 2025.

The largest extreme solar event to strike Earth occurred in 1859. Called the Carrington event, it caused telegraph lines to catch fire and made the Aurora Borealis visible as far south as Cuba and Australia. A similar-sized coronal mass ejection on July 23, 2012, though not aimed at Earth, served as a warning for many of the potential global economic catastrophe that could result.

It even got Wall Street’s attention, via a prominent mention in a 2014 investor letter from New York hedge fund Elliott Management.

“If that had hit the Earth,” said Riley of Predictive Science, “there would have been major consequences.”

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