Question

In which sentence is the underlined prepositional phrase an adverb phrase? The Milky Way is one of many star systems. Light from far away galaxies helps scientists figure out what stars are made of. The world’s largest telescope can be found at the Hawaiian observatory. Astronomers discovered a quasar 12 billion light years away in 1991.

Answer 1

Astronomers discovered a quasar 12 billion light years away in 1991.

Answer 2

I think it is the second sentence