👉 The term "galactometer" is a scientific instrument used to measure the temperature of celestial bodies like stars and planets. It uses an apparatus that measures the temperature of gases in the atmosphere, such as hydrogen or helium, which are emitted by the Sun. Galactometers were first developed in the 19th century for measuring the temperature of distant galaxies like the Andromeda Galaxy. They have since been used to measure temperatures on Earth and other celestial bodies, providing insights into how the universe
