NASA Astronauts (0.84) and the International Space Station (0.84) form a near-tied pair at the top of ISS Research's neighbor set — two distinct peaks that together define the shape of this audience, with everything else trailing by a meaningful gap.
The shape is two-peak: those two neighbors sit at 0.84 and 0.84 respectively, while the next closest, SpaceX (0.78) and NASA (0.78), drop roughly six points. Below them, NASA's Johnson Space Center (0.76), NASA Mars (0.75), and Hubble (0.75) extend a coherent cluster of government and research-organization neighbors. By subcategory, the top 10 breaks down as four Government entities, three Research Organizations, one Technology brand (SpaceX), one Blogs outlet (The Dodo at 0.74), and one Miscellaneous/Technology entry (Curiosity Rover at 0.73). ISS Research itself is a Research Organization, and three of its ten nearest neighbors share that subcategory — International Space Station, NASA Mars, and Hubble — while the majority are Government entities. The one genuine outlier is The Dodo, a consumer-facing animal-content blog, whose presence at position eight suggests a secondary audience segment that overlaps with this space-science crowd despite having no thematic connection to it.
The overall picture is a tightly domain-specific audience that bridges institutional space science and government space programs, with a narrow but real secondary signal from general-interest content consumption.