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tokens: will require not only a large number of telescopes but many person-hours to plan observations and process the data. Citizen astronomers, citizen science, and educational outreach offer an excellent opportunity to support future space missions. Given the brightness of the host stars of planets found by TESS , even modestly sized telescopes can be used to re-observe these systems, reducing the errors on their ephemerides. The ability of small ground-based telescopes to contribute to exoplanet science is well known (e.g. Kabath et al. 2019 ). The Next Generation Transit Survey (NGTS; Wheatley et al. 2018 ) has shown that sub-millimag precision is achievable by simultaneously observing the same transit with many identical small telescopes and combining data. Using such methods could expand the number of exoplanets that are observable from the ground. Here we present a project to refine the ephemerides of eight exoplanets using a fully robotic telescope network, observations from citizen astronomers, and data from TESS ; a significant portion of the work has been completed by high school students via the Original Research By Young Twinkle Students (ORBYTS) programme. 2 OUTREACH AND CITIZEN SCIENCE PROJECTS The observations and analysis presented here have been achieved via engagement with several citizen science and outreach initiatives and a brief description of each of these is given below. 2.1 Original Research By Young Twinkle Students ORBYTS is an educational programme in which secondary school pupils work on original research linked to the Twinkle Space Mission under the tuition of PhD students and other young scientists (McKemmish et al. 2017a ; Sousa-Silva et al. 2018 ). The ORBYTS programme has been run since 2012 and is jointly managed by Blue Skies Space Ltd. (BSSL) and University College London (UCL). The Twinkle Space Mission 1 is a new, fast-track satellite designed for launch by 2024 and has been conceived for providing faster access to space-based spectroscopic data. While the satellite will also survey Solar system objects (Edwards et al. 2019a , b ), a key science case for Twinkle is the characterization of a population of extrasolar planets via transit and eclipse spectroscopy (Edwards et al. 2019c ). ORBYTS offers school pupils the chance to enrich our understanding of these new worlds by improving our knowledge of the molecules they are made of, their orbits, and their physical properties. This provides a unique opportunity for pupils to undertake cutting-edge science, which has a meaningful impact on a future space mission. To achieve this, ORBYTS partners dynamic, passionate science researchers with secondary schools, where, through fortnightly school visits over an academic year, the researcher teaches the students undergraduate-level physics. The goal of every partnership is that school students will have the opportunity to use this new knowledge to contribute towards publishable research. Pupils get hands on