The solar observatory added signs along the highway in 2011 with the names of the planets as part of a 1:250 million model of the distances between planets in the Solar System.
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The observatory lies in New Mexico at the southern end of NM Scenic Byway 6563, about 18 miles (by car) south of Cloudcroft (on NM 82), and 40 miles southeast (by car) from Alamogordo (on NM 70 and 54), in the village of Sunspot inside of the Lincoln National Forest.