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Natural mystery
In Death Valley ’s Racetrack Playa , sway seem to slide across the insipid lakebed under their own power . Now , scientists have solved the mystery .
Geologic puzzle
The trail are the only evidence the tilt move . Some stretch twice the length of a football game field
On the playa
Biologist Richard Norris stands next to a Racetrack Playa rock-and-roll trail that may have take shape in the late 1990s .
The testing ground
A bowlder convey in to Racetrack Playa to study its sailing stones . Engineer Jim Norris of Interwoof built the custom GPS unit .
Look closely
The rock on the left side of the exposure is about to move , bulldozed by ice .
There, it moved!
In this photograph , the small white rock candy has shifted from the left to the right .
Racing rocks
Researchers saw rock-and-roll sail across Racetrack Playa and set fresh trails , bear witness here .
On thin ice
An lean shard of ice from Racetrack Playa ’s pond , collected Dec. 20 , 2013 .
Frozen wonder
A GPS - get on bowlder leaves a lead on Racetrack Playa
New tracks
Parallel lead carve in the wet playa mud .
