The positive space in an image typically refers to the main objects or subjects that stand out in the composition. In this case, if the image features a telescope, the positive space would most commonly be identified as the telescope itself, as it is the main focal point. Therefore, the best response would be:
is the telescope and the ground.
However, if the question is asking for what is not in the negative space, you might want to consider other options within the provided choices. The other options, such as "is the sky" or "is the stars," typically refer to the negative space, which is the background or the area that surrounds the positive space.