Astronomers are mapping how celestial bodies move through space on extended trajectories, from comets in the Oort Cloud shaped by stellar encounters to orbital debris decaying in Earth's atmosphere. New discoveries reveal unusual multi-body systems and the physics governing objects that take decades or centuries to complete single orbits.
·Long-period comets show orbital patterns influenced by close passages near distant stars like HD 7977
·TESS identifies a rare three-body system where a brown dwarf completes an orbit every eight years while warping two planets
·Solar cycles accelerate the orbital decay of low-Earth space debris over decades-long timescales
·Mega-constellations in low orbit are filling the same space where atmospheric drag naturally removes older junk
drawn from Astrobiology Web, Encyclopedia Britannica, Answers in Genesis, Tech Times · updated 7d ago