* Brightness is relative. We see stars as brighter or dimmer based on how much light reaches our eyes. This depends on:

* Intrinsic Brightness: How much light a star actually produces.

* Distance: Closer stars appear brighter, even if they are less luminous.

* The Sun is the brightest star in our sky. It's the closest star to Earth, making it appear incredibly bright.

So, the answer depends on what you mean by "brightest":

* Brightest star in our night sky: That would be Sirius, also known as the "Dog Star." It's a binary star system with a very luminous companion.

* Brightest star in the entire universe: We don't actually know the answer to this! There are many stars out there that are more intrinsically luminous than Sirius, but they are far, far away.

Let me know if you have any more questions!