As the orbital migration of moons depends on key factors like the density and temperature of dust particles in the circumplanetary disc at different distances out from the planet, they’ve modelled different systems to study what the configuration of moons ends up like as the disc disperses.

Their simulations showed, as had been expected, that large moons like Titan mostly lose orbital energy in the dusty disc and spiral in towards the planet to be devoured.

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So what seems most likely is that a giant planet ends up with either no large moons, or a system of several large moons, like the Galilean satellites, that were all saved because the circumplanetary disc was dissipated quickly enough after formation.

Jupiter has the 4 large Galilean moons – Io, Europa, Ganymede and Callisto – all the same order of magnitude in terms of size, whereas Saturn has the single giant moon, Titan.

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Yuri Fujii and Masahiro Ogihara, at the Department of Physics, Nagoya University, and National Astronomical Observatory of Japan, respectively, think they’ve found the answer.

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For particular combinations of moon mass and orbital radius, however, the overall balance of forces causes the moon to instead drift slowly outwards, or even hover at the same orbital distance; these are like safe patches, and a single giant moon is able to survive destruction.

Gas giant planets in our Solar System, Jupiter and Saturn are pretty similar to each other. They have similar compositions and are both around 100 times more massive than Earth, and so very much in a class of their own even compared to the ice giants Uranus and Neptune.

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What appears to have happened with Saturn is that several inner moons may have spiralled all the way in to be destroyed, but Titan formed in an outer orbit and migrated inwards until it settled in one of these safe patches.

These arise when an infant star is creating a new planetary system from the large disc of gas and dust swirling around it.

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This article originally appeared in the July 2020 issue of BBC Sky at Night Magazine.Prof Lewis Dartnell is an astrobiologist at the University of Westminster.

Large moons coalescing in this dusty skirt of material tend to spiral in towards the planet as they experience drag from their interaction with the surrounding gas and dust: they are at danger of diving all the way down into the gas giant and becoming destroyed.

Some moons – like Neptune’s Triton, or Phoebe around Saturn – are captured objects, but the majority of satellites around the giants are believed to be born in circumplanetary discs.

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Finishing with just a single large moon, however, seems much more difficult and leads to the question of how Titan formed.

Lewis was reading Formation of single-moon systems around gas giants by Yuri I Fujii and Mashahiro Ogihara. Read it online at https://arxiv.org/abs/2003.05052.

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Note: Speeds and Feeds are only general starting points and may vary depending on specific applications. MILLING Working Material Application Cutting Speed fpm Cutting Speed m/min Chip Load ipt Chip Load mm/t ALUMINUM Aluminum (5–8% Si) (356, 308, 242, 208) Rough Milling 2000–5000 610–1525 0.010–0.020 0.254–0.508 Aluminum (5–8% Si) (356, 308, 242, 208) Finish Milling 2000–6000 610–1830 0.005–0.010 0.127–0.254 Aluminum Cast (8–12% Si) (354, 357, 380) Rough Milling 1500–4000 460–1220 0.007–0.015 0.178–0.381 Aluminum Cast (8–12% Si) (354, 357, 380) Finish Milling 1500–5000 460–1525 0.004–0.008 0.102–0.204 Aluminum Cast (12–18% Si) (390) Rough Milling 1000–2000 305–610 0.005–0.010 0.127–0.254 Aluminum Cast (12–18% Si) (390) Finish Milling 1000–3000 305–915 0.002–0.006 0.050–0.150 OTHER MATERIALS Babbitt Milling 700–1100 210–335 0.003–0.010 0.076–0.254 Brass Milling 2000–4000 610–1220 0.001–0.008 0.025–0.200 Bronze Milling 900–1350 275–410 0.003–0.008 0.076–0.200 Carbon Milling 500–2000 150–610 0.0003–0.012 0.008–0.305 Carbon Fiber Materials Milling 500–2000 150–610 0.003–0.015 0.076–0.381 Copper Milling 750–1500 230–460 0.001–0.008 0.025–0.200 Glass Fiber Material Milling 750–1500 230–460 0.001–0.010 0.025–0.254 Green Ceramic Materials Milling 500–1500 150–460 0.002–0.010 0.050–0.254 Unfilled Plastic Milling 1000–4000 305–1220 0.003–0.020 0.076–0.508 Wood Milling 3300–9800 1000–3000 0.004–0.030 0.102–0.762 TURNING Working Material Application Cutting Speed fpm Cutting Speed m/min Chip Load ipt Chip Load mm/t ALUMINUM Aluminum (5–8% Si) (356, 308, 242, 208) Rough Turning 2000–5000 610–1525 0.010–0.025 0.254–0.635 Aluminum (5–8% Si) (356, 308, 242, 208) Finish Turning 2000–6000 610–1830 0.005–0.010 0.127–0.254 Aluminum Cast (8–12% Si) (354, 357, 380) Rough Turning 1500–4000 460–1220 0.007–0.020 0.178–0.508 Aluminum Cast (8–12% Si) (354, 357, 380) Finish Turning 1500–5000 460–1525 0.004–0.008 0.102–0.204 Aluminum Cast (12–18% Si) (390) Rough Turning 1000–2000 305–610 0.005–0.010 0.127–0.254 Aluminum Cast (12–18% Si) (390) Finish Turning 1000–3000 305–915 0.002–0.006 0.050–0.150 OTHER MATERIALS Babbitt Turning 700–1100 210–335 0.003–0.010 0.076–0.254 Brass Turning 2000–4000 610–1220 0.003–0.015 0.076–0.381 Bronze Turning 900–1350 275–410 0.003–0.010 0.076–0.254 Carbon Turning 500–2000 150–610 0.005–0.015 0.127–0.381 Carbon Fiber Materials Turning 500–2000 150–610 0.003–0.020 0.076–0.508 Copper Turning 750–1500 230–460 0.003–0.010 0.076–0.254 Glass Fiber Material Turning 750–1500 230–460 0.001–0.015 0.025–0.381 Green Ceramic Materials Turning 500–1500 150–460 0.002–0.020 0.050–0.508 Unfilled Plastic Turning 1000–4000 305–1220 0.003–0.020 0.076–0.508 Wood Turning 3300–9800 1000–3000 0.004–0.030 0.102–0.762 DRILLING Working Material Application Cutting Speedfpm Cutting Speedm/min Chip Loadipt Chip Loadmm/t ALUMINUM Aluminum(5–8% Si) (356, 308, 242, 208) Drilling 2000–6000 610–1830 0.001–0.010 0.025–0.254 Aluminum Cast(8–12% Si) (354, 357, 380) Drilling 1500–5000 460–1525 0.001–0.010 0.025–0.254 Aluminum Cast(12–18% Si) (390) Drilling 1000–3000 305–915 0.001–0.010 0.025–0.254 OTHER MATERIALS Babbitt Drilling 700–1100 210–335 0.001–0.010 0.025–0.254 Brass Drilling 2000–4000 610–1220 0.001–0.010 0.025–0.254 Bronze Drilling 900–1350 275–410 0.001–0.010 0.025–0.254 Carbon Drilling 500–2000 150–610 0.001–0.010 0.025–0.254 Carbon Fiber Materials Drilling 500–2000 150–610 0.001–0.010 0.025–0.254 Copper Drilling 750–1500 230–460 0.001–0.010 0.025–0.254 Glass Fiber Material Drilling 750–1500 230–460 0.001–0.010 0.025–0.254 Green Ceramic Materials Drilling 500–1500 150–460 0.001–0.010 0.025–0.254 Unfilled Plastic Drilling 1000–4000 305–1220 0.001–0.010 0.025–0.254 Wood Drilling 3300–9800 1000–3000 0.003–0.025 0.076–0.635

One of the largest moons in the Solar System, Titan’s even bigger than the planet Mercury. But what determines whether a gas giant gets a family of sizeable moons or a single jumbo satellite?