APPENDIX IV Interplanetary dust, zodiacal light Astronomers have detected remnant and new interplanetary dust - the product of the arrival of interstellar dust and comets - in our solar system. It is called zodiacal dust and generates a luminescence that can be seen in the plane of the planets, that is, the plane of the ecliptic, where the accretion disk was, in the beginning. Interplanetary dust (IDPs) is composed of particles up to 100 mm,