* Constellations are patterns: They're groupings of stars that appear close together from Earth, but they're not actually physically close to each other in space.
* Brightness matters: Some stars in a constellation are very faint and hard to see, while others are extremely bright.
* Different sources have different lists: Depending on the source, you might find different numbers of stars included in a constellation.
However, Leo, the Lion, is often recognized as having about 70 stars visible to the naked eye. This is just an approximation though.
It's more accurate to say that Leo contains many stars, including some very famous ones like Regulus (its brightest star).
