When Miguel was a child, he was attacked by a swarm of hornets in his backyard. Now, every time he hears the sound of hornets he immediately becomes frightened. This is an example of conditioning.

they are known to reach a speed of 21 miles per hour

the statements that apply here about binary star system are

"have stars that might appear to wobble"

"often have one star that is brighter than other"

a binary star is a star system consisting of two stars revolving around their common barycenter. systems of two or more stars are called multiple star systems.