The Solar System has no predefined limits.
Generally the limit of the Solar System and interstellar space is at a place called the Roche limit where our own Sun's gravitational influence is diminished by another - usually star - interstellar object.
This boundary is generally accepted to be the mean distance between our Sun and Alpha Centauri A or about 2 light years from the Sun.
Voyager 1 and Voyager 2. There is a matter of some debate as to whether the two Voyager probes have actually left the solar system, an where the "edge" of the solar system actually is. Both are beyond the orbit of Pluto, but have not passed beyond the vaguely-defined Kuiper Belt, and the two probes are just approaching the heliopause, the boundary layer between the solar wind and the broader currents of interstellar space. But it seems likely that however that boundary is defined, the two Voyager probes either were or will be the first man-made objects to pass it.
Voyager 1 and Voyager 2 have both left the heliosphere, but neither has left the solar system. The edge of the solar system is considered to be the outer boundary of the Oort Cloud, The exact width of the Oort Cloud is not known, but its estimated that it would take Voyager 2 about 300 years to reach the inner boundary of it. To reach the outer boundary of the Oort Cloud, truly leaving the solar system, would take Voyager 2 something like 30,000 years.
"Our solar system." The "part of our galaxy" that's in our solar system is the solar system.
Sirius is not part of our Solar System, so it is not appropriate to talk about "other objects in the solar system".
The Solar System[a] consists of the Sun and the astronomical objects bound to it by gravity, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago.A galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas dust, and an important but poorly understood component tentatively dubbed dark matter.[1][2] The name is from the Greek rootgalaxias [γαλαξίας], literally meaning "milky", a reference to the Milky Way galaxy.
it was born from the interstellar cloud
The solar system was previously a cloud of interstellar gas.
A collapsing interstellar sloud
The two Voyager satellites have left the solar system and passed the "heliopause", the boundary layer between the solar system and deep space.
The solar system formed from the gravitational collapse of a cloud of interstellar gas.
No
They're distant cousins.
It could be called interstellar space or terrestrial.
The heliosphere boundary.
The asteroid belt is generally regarded as the boundary between the inner solar system and the outer solar system.
Voyager 1 and Voyager 2. There is a matter of some debate as to whether the two Voyager probes have actually left the solar system, an where the "edge" of the solar system actually is. Both are beyond the orbit of Pluto, but have not passed beyond the vaguely-defined Kuiper Belt, and the two probes are just approaching the heliopause, the boundary layer between the solar wind and the broader currents of interstellar space. But it seems likely that however that boundary is defined, the two Voyager probes either were or will be the first man-made objects to pass it.
The stars (except for the sun) along with interstellar gas and dust, are in our galaxy but are outside our solar system. Then there are other galaxies outside our own.