Informal chats in a space walk is fictional. Every action during a space walk is premeditated in order to avoid unnecessary ambling and minimize the use of oxygen.
The possibility of the Hubble telescope and a destroyed Russian satellite colliding in the space is fictional because of the following reasons:
The Hubble telescope orbits at an altitude of 500 kilometres above the earth. The film claims that the Russian satellite is also in orbit at the same height. It is wrong because this type of communication satellites which are called TDRSS (Tracking and Data Relay Satellite System) stay in the geosynchronous orbit which is much higher (i.e.) almost 35000 km above the earth. The film showing the Hubble Telescope, ISS and Tiangong-1 located close to each other is fictional. In fact, these three man-made structures are not only at different heights but also lie in different orbits around the earth.
The scene in which Dr. Stone’s tears trickle down heT cheeks and then floats is fictional as it doesn’t happen that way in space.
