The beginning has some trouble in distinguishing the planets from the stars but the following difference in appearance may help. The stars are so distant that they shine only as points of light even through the largest telescopes. In consequence, their light is unsteady because of disturbances in the Eath’s atmosphere, such as the rising of warm currents and the falling of cold curents. Thus the stars twinkle.
The planets on the other hand, are very much nearer -so near that with the exception of Pluto they show as discs in our large telescopes and not as single points of light. Therefore their light is not so much affected by disturbances in our atmosphere. It is usually said that planets do not twinkle, but shine with a steady light.