It's a bit of a trick question! While some planets have rings that are *very faint* and difficult to see, all of the planets with rings have rings that are visible with the right equipment.

Here's why:

* Earth: Technically, Earth has a ring, but it's made up of dust and debris and is extremely faint. It's not visible with the naked eye and requires specialized instruments to detect.

* Jupiter, Saturn, Uranus, and Neptune: These planets all have prominent rings that are visible through telescopes, although some are more faint than others.

So, while some rings might be too faint to see with just your eyes, they are still technically *visible* with the right tools.