der Planet
planet
A large celestial body that moves in an orbit around a star and does not shine by itself.
Der Mars ist als der „rote Planet“ bekannt.
Mars is known as the 'red planet'.

planet
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planet
A large celestial body that moves in an orbit around a star and does not shine by itself.
Der Mars ist als der „rote Planet“ bekannt.
Mars is known as the 'red planet'.

'Planet' (planet) is a masculine noun of the N-declension. This means it takes the ending '-en' in the genitive, dative, and accusative singular, as well as throughout the plural.
Die Raumsonde fliegt zu einem fernen Planeten.
The space probe is flying to a distant planet.
In an astronomical context, 'Planet' (planet) is often used with verbs such as 'einen Planeten entdecken' (to discover a planet), 'einen Planeten umkreisen' (to orbit a planet), or 'auf einem Planeten landen' (to land on a planet).
Forscher haben einen neuen Planeten entdeckt, der unsere Sonne umkreist.
Researchers have discovered a new planet that orbits our sun.
The noun 'Planet' (planet) is the basis for other words. The related adjective is 'planetarisch' (planetary) and describes things that have to do with planets.
Die Anziehungskraft verursacht die planetarische Bewegung.
Gravity causes planetary motion.
star
'der Stern' and 'der Planet' both belong to the topic of outer space and can be visible in the sky as bright points. The important difference is: a star gives off its own light, while a planet does not shine by itself but moves around a star. Learners may confuse the words because both can be seen at night and both look like lights in the sky. If you are talking about the Sun or a celestial body that shines by itself, 'Stern' is correct. If it is about Earth, Mars, or Jupiter, 'Planet' is correct.

Welcher Planet ist der Erde am nächsten?
Which planet is closest to Earth?
Am klaren Abend sieht man über dem Dorf viele Sterne.
On a clear evening, you can see many stars above the village.