Astronomy is the study of the universe and its contents, including stars, planets, galaxies, and other celestial bodies. Astronomers use a variety of methods to measure the mass of objects in space. These methods include using the Doppler effect, gravitational lensing, and spectroscopy. The Doppler effect is a phenomenon that occurs when an object moves away from or towards an observer.
As the object moves, its light waves are stretched or compressed, resulting in a change in frequency. This change in frequency can be used to measure the speed of the object and its distance from the observer. By combining this information with the object's brightness, astronomers can calculate its mass. Gravitational lensing is another method used by astronomers to measure mass in space.
This technique relies on the fact that gravity bends light. When light passes through a region of space with a large amount of mass, it is bent and focused into a lens-like shape. By measuring the amount of bending, astronomers can calculate the mass of the object causing it. Spectroscopy is a technique used to measure the composition of an object in space.
By analyzing the light emitted by an object, astronomers can determine its temperature, density, and other properties. This information can then be used to calculate its mass. Astronomers also use other methods to measure mass in space, such as tracking the orbits of objects around each other and measuring their gravitational pull. By combining all of these techniques, astronomers can accurately measure the mass of objects in space.