What are polar orbits around a star or galaxy? What are retrograde orbits?
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- How do tidal interactions affect the structure and kinematics of dwarf galaxies? What are the orbits of stars in low surface brightness galaxies?
- What are the long-term stability of orbits in hierarchical triple star systems? What are the Kozai-Lidov mechanism and its effects on stellar and planetary orbits?
- What are the orbits of stellar black holes? How do supernova explosions affect the orbits of binary companions?
- What are stable and unstable orbits? What are some open questions about stellar orbits?
- How does gravity affect stellar orbits? Why do stars orbit?
- What are tidal tails of star clusters? How do stellar orbits relate to the chemical evolution of galaxies?
- How do stellar orbits provide evidence for the existence of a supermassive black hole at the center of the Milky Way? What are the orbits of stars used to measure the mass of the supermassive black hole Sagittarius A*?
- What are globular clusters, and how do stellar orbits differ within them? How do interactions between stars in clusters affect their orbits?
- What is the orbital period of a star?
- How does the galactic halo influence the orbits of stars? What are astrometric binaries?
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