The closest star to Earth in the constellation Aries is Hamal (α Arietis). However, it's not actually that close! Hamal is about 65.8 light-years away from our planet.

It's important to note that the concept of "closest star" is a bit tricky. Stars within the same constellation can be vastly different distances from Earth. For example, while Hamal is the closest star in Aries, there are other stars much closer to us, just in different constellations.