They have to orbit the sun or orbit a planet. This means they are if they are in the Galaxy.
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Comets are considered to belong to the solar system if they orbit the Sun. They are icy bodies that typically have elongated orbits that bring them close to the Sun at some point.
The Oort Cloud.
Comets are considered minor members of the solar system because they are smaller and less massive than planets and asteroids. They are composed of ice, dust, and rocky material, and often have highly elliptical orbits that take them far from the Sun. Comets are less numerous and play a smaller role in the dynamics and structure of the solar system compared to planets and asteroids.
Comets are made up of remnants from the early solar system, so their age is generally around the same as our solar system, approximately 4.6 billion years old. While some comets may contain even older material from beyond our solar system, as a whole, comets are not older than our solar system.
Nobody let them in. They formed with the solar system.
Comets Time Capsules of the Solar System - 1981 was released on: USA: 1981