Here's why:

* Outer space is considered a global commons: The Outer Space Treaty of 1967, which most countries have signed, states that outer space, including celestial bodies like stars, is the "province of all mankind." This means that no nation or individual can claim ownership of them.

* Stars are far too vast: Stars are incredibly distant and massive. It's impossible to physically control or possess something so immense.

* Legal limitations: Even if someone tried to "own" a star, there's no legal framework to recognize such a claim.

While some companies sell "star naming" certificates as novelty gifts, these have no legal standing and don't actually grant ownership.

So, while we all can enjoy the beauty of the stars, they truly belong to everyone and no one at the same time!