Cool your jets.

Probably they don’t have snappy Captain Video-style uniforms, but NASA has Planetary Defense Officers. I learned this because one of them made an announcement from their Washington D.C. headquarters about an asteroid that will pass Earth tomorrow: "There is absolutely nothing for concern by this pass of 2016 NF23. This object is merely designated a Potentially Hazardous Asteroid (PHA) because its orbit over time brings it within 5 million miles (8 million kilometers) of Earth's orbit, but there is nothing hazardous to Earth or even unique about this pass of the asteroid." So, you’re reassured, right? I know I am.