The brightest planet in the morning sky varies depending on the time of year and the planet's position in its orbit. However, the most likely candidates are:

* Venus: Often referred to as the "Morning Star", Venus is typically the brightest planet visible in the morning sky. Its brightness is due to its thick, reflective atmosphere.

* Jupiter: Jupiter is the largest planet in our solar system and is often a prominent feature in the morning sky. While not as bright as Venus, it can still be very noticeable.

* Mars: Mars is a reddish planet that can be quite bright in the morning sky at certain times of the year.

To know for sure which planet is the brightest in the morning sky, you would need to consult a star chart or an astronomy website that provides real-time information about celestial objects.