* We can't see all the stars: Our telescopes can only see a limited distance into the vastness of space.
* Stars are constantly forming: New stars are being born all the time, so the number is always changing.
* The universe is expanding: As the universe expands, the distance between galaxies increases, making some stars too far away to see.
However, astronomers have estimated that there are trillions of stars in the observable universe. Some estimates go as high as 100 trillion stars!
Remember, this is just a rough estimate. The actual number could be much higher or lower.
