You've got to be ready at dawn tomorrow to see something pretty incredible.

Good things are worth waiting for, but it’s still an excellent reason to see this one if you can.

Estimating a mass for a potentially hazardous asteroid (PHA) is perhaps the single most important thing to understand about it, after its trajectory. Actually doing so isn’t easy though, as the mass for objects in the tens to hundreds of kilometers in size are too small to have their mass calculated by traditional radio-frequency tracking techniques. A new paper from Justin Atchison of the Johns Hopkins University Applied Physics Laboratory and his co-authors proposes a method that could find the mass of asteroids even on the smaller end of that range, but will require precise coordination.

This weird slice of history actually takes on a kind of sense when you look at what brought it about.

“We are the last generation who can act."