👉 In physics, heliostat refers to a hypothetical structure or device that is designed to mimic the shape of Earth's atmosphere. Helium in its pure form behaves as an ideal gas at low temperatures and pressures, but it can also behave like liquid helium when heated up above a certain temperature. This phenomenon, known as "helium paradox," has been proposed by physicists such as Jean-Louis Chazelle and Joseph Sibony. The term "heliotrope" is often used
