The source of our galaxy's proper motion is believed to be a combination of two factors: the gravitational pull of the Milky Way's neighboring galaxies and the distribution of dark matter within our galaxy.
Scientists measure the proper motion of our galaxy by studying the movements of stars within the Milky Way. This is done through precise measurements of a star's position over a period of time.
No, the source of our galaxy's proper motion is not constant. The gravitational pull of neighboring galaxies and the distribution of dark matter within our galaxy can change over time, causing fluctuations in our galaxy's proper motion.
The proper motion of our galaxy has a small impact on our solar system, but it is not significant enough to cause any major changes. The gravitational pull of the Milky Way's neighboring galaxies can cause slight disturbances in the orbits of our planets, but these effects are minimal.
No, the source of our galaxy's proper motion cannot be observed directly. Scientists can only measure the effects of the source through precise observations and calculations.