3.6 Apply Techniques F3, F4 and F5 to improve flow between linked paragraphs
The next paragraph transition also uses a single linking word (bolded) rather than an explicit statement of what the link is.
Because the caustic point and the star on the celestial sphere both have dimension zero, as the camera moves, causing the caustic point to move relative to the star, there is zero probability for it to pass through the star. Therefore, the star’s two images will never cross the Einstein ring; one will remain forever outside it and the other inside—and similarly for all other stars in the star field.
However, if a star with finite size passes close to the ring, the gravitational lensing will momentarily stretch its two images into lenticular shapes that hug the Einstein ring and will produce a great, temporary increase in each image’s energy flux at the camera due to the temporary increase in the total solid angle subtended by each lenticular image. This increase in flux still occurs when the star’s actual size is too small for its images to be resolved, and also in the limit of a point star. For examples, see Riazuelo’s film clip.
James O et al Classical and Quantum Gravity 2015 Gravitational lensing by spinning black holes in astrophysics, and in the movie Interstellar
Photo by Paige Weber on Unsplash
If I were editing this text, I would recommend merging the two paragraphs into a single paragraph, because neither paragraph is very long.
Alternately, I would recommend adding words around the linking word at the start of paragraph two, to explicitly show how it links to paragraph one.
In addition to the above-mentioned possible images, another image that can result from this setup is …
On the next page, let’s look at an example of explicit and flowing linking between paragraphs.