Surrounded by smaller spiral-shaped ‘satellite’ galaxies such as the Triangulum galaxy, astronomers who observe it speculate that the Andromeda galaxy will collide with the Milky Way in a few billion years.
A. Surrounded by smaller spiral-shaped ‘satellite’ galaxies such as the Triangulum galaxy, astronomers who observe it speculate that the Andromeda galaxy
B. Astronomers observe the Andromeda galaxy, speculating that it is surrounded by smaller spiral-shaped ‘satellite’ galaxies and that it
C. Astronomers observing the Andromeda galaxy, which is surrounded by smaller spiral-shaped ‘satellite’ galaxies such as the Triangulum galaxy, speculate that it
D. Astronomers who observe it speculate that the Andromeda galaxy, which is surrounded by smaller spiral-shaped satellite galaxies such as the Triangulum galaxy and which
E. Observing the Andromeda galaxy and surrounded by smaller spiral-shaped satellite galaxies such as the Triangulum galaxy, astronomers speculate that it