How does the gravity of planets and moons affect stars?

Thanks!

Which planets, moons and stars?

The effect of gravity is mutual, with the effect on the stars directly related to the relative size of its planets and moons and inversely related to the distance of them from the star. However, multiple planets and moons may cancel out or reduce their final effects on the star.

Since this is not my area of expertise, I searched Google under the key words "star planets moons gravity" to get these possible sources:

http://www.school-for-champions.com/science/gravity_universe.htm
(Broken Link Removed)

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.

I hope this helps. Thanks for asking.

The planets orbiting a star can make it "wobble", because while it is obvious that the star gravitationally influences the motion of the planets, gravitational attraction is a two-way affect, and the planets also influence the star's motion (though since they are much less massive, the sun is "perturbed" less so than the planets).

Seeing the wobble of stars is how astronomers detected the first several dozen exoplanets (planets outside our own solar system).

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The gravity of planets and moons does have an effect on the stars, albeit a relatively small one. Let me explain how.

First, it's important to understand that gravity is a force that attracts objects towards each other. The larger the mass of an object, the stronger its gravitational pull.

Planets and moons, although much smaller than stars, still have mass. This means they exert a gravitational pull on nearby objects, including stars. However, since stars are generally much more massive than planets or moons, the effect of gravity is usually more noticeable in the interaction between celestial bodies.

One way the gravity of planets and moons affects stars is through gravitational perturbations. Large planets or moons with strong gravitational fields can slightly tug on a star, causing it to wobble or oscillate. Astronomers can observe these subtle changes in a star's position by using precise measurements and monitoring its movement over time. This information can provide valuable insights into the properties of planets and moons.

Another significant effect is the gravitational lensing phenomenon, where the gravity of a planet or moon can bend or distort the path of light coming from a distant star. This gravitational lensing can cause the star's light to appear brighter or distorted in a characteristic way. Astronomers can study this effect to gain insights into the mass distribution of the planet or moon and also to detect exoplanets (planets outside our solar system).

It's important to note that the gravitational effect of planets and moons on stars is relatively small compared to other factors influencing stellar behavior. Factors such as nuclear reactions in a star's core, stellar winds, and interactions with other stars in a stellar system play a more significant role. However, studying the gravitational effects of planets and moons on stars can still provide valuable information to astronomers and contribute to our understanding of the universe.