How do scientists know that earths gravity and magnetism can work through gases solids and liquids?

Scientists know that Earth's gravity and magnetism can work through gases, solids, and liquids because they have observed these effects in various materials and environments. They have conducted experiments and studies to understand the behavior of gravity and magnetism in different mediums and have found consistent results. Additionally, theoretical models and mathematical equations have been developed to explain how gravity and magnetism can act through different states of matter.