How far away was that lightning?

You probably do it. It might be ingrained from when you were a kid, and now it's almost automatic. You see the flash of lightning – and you immediately start counting the seconds till it thunders.

Are there enough chemicals on icy worlds to support life?

For decades, scientists have believed that there could be life beneath the icy surface of Jupiter's moon Europa. Since that time, multiple lines of evidence have emerged that suggest that it is not alone. Indeed, within the ...

When inertial frames of reference collide

In an inertial frame of reference, a body with zero net force acting on it does not accelerate. When scientists speak of inertial frames of reference, they're invoking a coordinate system with no external influences, and ...

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