Final answer:
The Doppler effect helps us measure planet properties by analyzing the changing speeds and spectral shifts of stars. It is used in the Doppler method of detecting planets and measuring the rotational speed of stars, including planets.
Step-by-step explanation:
The Doppler effect in physics is used to measure various properties of planets. One way Doppler shift helps us measure planet properties is through the Doppler method of detecting planets. This method involves measuring the changing speed of a star that is orbiting a planet. When the star is moving away from us, it exhibits a tiny redshift, and when it is moving toward us, it shows a tiny blueshift. By analyzing these shifts in the star's spectrum, astronomers can determine the presence and properties of the planet.
Doppler effect can also be used to measure the rotational speed of a star, including planets. As an object rotates, the side approaching us experiences a blueshift, while the side moving away exhibits a redshift. By observing these Doppler shifts in the light from rotating planets, astronomers can determine their rotational speeds.
Overall, the Doppler effect plays a crucial role in measuring planet properties by allowing astronomers to analyze the changing speeds and spectral shifts of stars that are orbiting planets or are rotating themselves.