Tracker jokes

I can measure the speed of an object, because I want to km/s.

The definition of a stalker is two people going on a romantic walk, but only one person knows about it.

I think my neighbor is stalking me as she's been googling my name on her computer.

I saw it through my telescope last night.

Humanity.

Like if you have a boyfriend, girlfriend, or husband, or wife, or a crush.