Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.

original question: which are the planets that are part of [Solar System]?
answer: pluto, eris
answer type: Plutoid.
auxiliary information: The Solar System comprises the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets that form the planetary system around it, while the remainder are significantly smaller objects, such as dwarf planets and small Solar System bodies such as comets and asteroids. Of those that orbit the Sun indirectly, two are larger than the smallest planet. The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in the Sun, with most of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials.
Which planets make up the [Solar System]?

original question: What is the spectral type of the star that is in the [Galactocentric orbit]?
answer: g2v
answer type: Spectral Type.
auxiliary information: An orbit about the center of a galaxy. Earth's sun follows this type of orbit about the galactic center of the Milky Way.
What is the spectral type of the star that is in the [Galactocentric orbit]?

original question: Which automobile model year has a previous model year [2015 Chevy Spark]? 
answer: 2016 chevy spark
answer type: Automobile Model Year.

[2015 Chevy Spark] was made in what model years?