Eric Walker added New comet likely visitor from another solar system to C/2019 Q4

Eric Walker added a number of topics and a number of links to Specific asteroids and comets, and added Specific asteroids and comets to Asteroids, comets, meteors and meteorites

Eric Walker added New comet likely visitor from another solar system to C/2019 Q4, and added C/2019 Q4 to Specific asteroids and comets