Definition: 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.
Input: original question: How many planets are orbiting in [Heliocentric orbit]?
answer: 7
answer type: Planet.
auxiliary information: A heliocentric orbit is an orbit around the barycenter of the Solar System, which is usually located within or very near the surface of the Sun. All planets, comets, and asteroids in our Solar System are in such orbits, as are many artificial probes and pieces of debris. The moons of planets in the Solar System, by contrast, are not in heliocentric orbits as they orbit their respective planet. The barycenter of the Solar system, while always very near the Sun, moves through time depending on where other large bodies in the solar system, such as Jupiter and other large gas planets, are located at that time. A similar phenomenon allows the detection of extrasolar planets by way of the radial velocity method. The helio- prefix is derived from the ancient Greek word helios, meaning "sun", and also Helios, the personification of the Sun in Greek mythology. The first spacecraft to be put in a heliocentric orbit is Luna 1, which was planned to go to the moon but instead missed due to an incorrectly timed upper stage burn.

What number of planets are on the [Heliocentric orbit]?