“Trump knows exactly who is responsible for this attack, and knows that other states were hit too. This is what modern warfare looks like, and it further illustrates there’s no plan to win a war with Iran.”

—Governor Tim Walz responds to Trump blaming Minnesota for cyberattacks on its own water systems, the Washington Post reports.

One More Thing

RANDY MONTOYA/SANDIA NATIONAL LABORATORY

Meet the researchers testing the “Armageddon” approach to asteroid defense 

One day a big asteroid will find itself on a collision course with Earth. If we are lucky, it’d land in the middle of the vast ocean, creating a good-size but innocuous tsunami, or in an uninhabited patch of desert. But if it has a city in its crosshairs, one of the worst natural disasters in modern times would unfold. Homes dozens of miles away would fold like cardboard. Millions of people would die.

Fortunately for all 8 billion of us, planetary defense—the science of preventing asteroid impacts—is a highly active field of research. 

We already know that we could ram a rock with an uncrewed spacecraft to push it away from Earth. But if that’s not enough, we could need another method, one that is notoriously difficult to test in real life: a nuclear explosion. 

Read our story about the scientists who, despite the odds, are trying to do exactly that. 

—Robin George Andrews