Final answer:
Alex and his father's trip to Beijing arises from Alex's isolation and study of Chinese astronomy, suggesting they may be looking forward to cultural and scientific experiences. Historical US-China relations and personal reasons likely also play a role in their journey.
Step-by-step explanation:
Alex and his father are planning a trip to Beijing under complex circumstances. Alex, having been isolated due to his father's fear and inability to connect with him, has used his time to learn about Chinese astronomy. This knowledge could be one of the reasons why they are now looking to travel to China. Both of them might be looking forward to experiencing Chinese culture and possibly the astronomical advancements or historical sites related to Alex's studies.
The context of this trip could also be influenced by historical relations between China and the United States. During the Cold War, China became an important economic partner for the US, leading to the opening of diplomatic relations after President Nixon's visit to Beijing. Despite the tense political atmosphere, such as the various stances held by President Trump and President Biden towards China or human rights concerns like the Tiananmen Square massacre, there seems to be a personal reason for their journey.
The reason for the trip and what Alex and his father are eager to see or do in China, however, are not fully detailed in the provided reference materials. It is probable that they are looking to explore cultural, historical, and scientific aspects of China that resonate with Alex's interests and their personal circumstances.