Final answer:
The term that includes all of space and time, along with their contents such as planets, stars, and various forms of matter and energy, is the Universe.
Step-by-step explanation:
What is included in all of space and time and their contents, such as planets, stars, galaxies, and all other forms of matter and energy? The answer is 1) Universe. This encompasses everything that exists within the space-time continuum, including the mass in the Milky Way, smaller celestial bodies like asteroids and comets, as well as the fundamental forces of the universe like gravity. Stars are not eternal, as they eventually run out of fuel, leading to their demise and the recycling of their matter back into the galaxy, rendering us and everything around us as made of 'star dust'.