It's impossible to say exactly how many planets are in the universe. We can only estimate based on what we've observed so far.

Here's what we know:

* Billions of galaxies: There are billions of galaxies in the observable universe.

* Stars in galaxies: Each galaxy contains billions of stars.

* Planets around stars: We know that planets are common around stars. In fact, most stars likely have at least one planet.

Based on these facts, astronomers estimate that there are trillions of planets in the observable universe.

However, this is just an estimate. We can't see all the planets out there, and we are constantly discovering new ones. It's likely that the actual number is even higher than our current estimates.