The excerpt does not provide specific information regarding the temperature of deep space, how galaxies and stars formed, the future of the universe, or when the universe formed. However, it suggests that the Big Bang theory, which addresses the formation of the universe, is incomplete. This implies that while the theory provides some answers, further exploration is needed to fully understand these concepts.
Since none of the options directly stem from the provided text, if you are looking for an inferred question related to the excerpt, "How did galaxies and stars form?" would be the most relevant, as it relates to the incomplete aspects of the Big Bang theory mentioned in the excerpt. But again, the excerpt does not specifically answer this question.