My brother was driving north on U.S. Route 85 about 17 miles from Mason and I noticed a space ship over the horizon. I said look, their is a space ship there. My brother looked and acknowledged it as well. I looked to make sure it wasn't an air plain but it clearly was an oval shaped craft that disappeared with in 10 seconds. I could not determine how large or how far away it was. We were facing forward and slightly up toward the upper third of the windshield. The only other objects in the sky were hawks.