An star system is made of two stars. An star system is made of no more than a few thousand stars.
Anstar system is made of more than a million stars.

A star system is made of two stars.

Explanation:

A star system is a system made up of a few number of stars orbiting each other, and bound by gravitational attraction. It is also known as a 'stellar system', and can be made up of two, or more stars. The star system composed of two stars is known as a Binary star system, and both stars circle the center of mass of their system. Multiple star system composed of three or more stars also exists, although rarely, and the stars in such systems are bound by gravitational attraction, although distance between them may or may not be close. A very large group of more than a hundred to a thousand cluster of stars is known as a 'Open Star Cluster.'

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

it is a negative acceleration