This is the 13604th most frequent Polish word.
planetami
"Planetami" means "planets" in the instrumental case (plural) in Polish.
In this sentence, 'planetami' is used in the instrumental case to indicate the means or tools by which the action is carried out, meaning 'with the planets'.
Obserwujemy ruch planetami na niebie.
We observe the movement of the planets in the sky.
Here, 'planetami' is in the instrumental case in a description context, suggesting involvement or area of focus ('with planets').
Interesuję się różnymi planetami w kosmosie.
I am interested in different planets in space.
In this use, 'planetami' is in the instrumental case, depicting 'between planets' as means or context for the action.