context: Planetary geologists have measured different abundances of oxygen isotopes in samples from the Earth, the Moon, Mars, and meteorites, but were long unable to obtain reference values for the isotope ratios in the Sun, believed to be the same as those of the primordial solar nebula. Analysis of a silicon wafer exposed to the solar wind in space and returned by the crashed Genesis spacecraft has shown that the Sun has a higher proportion of oxygen-16 than does the Earth. The measurement implies that an unknown process depleted oxygen-16 from the Sun's disk of protoplanetary material prior to the coalescence of dust grains that formed the Earth.
question: What molecule does the Sun have in higher proportion than Earth?
answers: oxygen-16 oxygen-16 oxygen-16 oxygen-16 oxygen-16
content_span_normalized_text: analysis of a silicon wafer exposed to the solar wind in space and returned by the crashed genesis spacecraft has shown that the sun has a higher proportion of oxygen-sixteen than does the earth.
question_normalized_text: what molecule does the sun have in higher proportion than earth?
context_asr: PLANETARY GEOLOGISTS HAVE MEASURED DIFFERENT ABUNDANCES OF OXYGEN IOTUPS AND SAMPLES FROM THE EARTH THE MOON MARS AND METEORITES BUT WERE LONG UNABLE TO OBTAIN REFERENCE VALUES FOR THE ITOP RATIOS IN THE SUN BELIEVED TO BE THE SAME AS THOSE OF THE PRIMORDIAL SOLAR NEBULA ANALYSIS OF A SLOON WAFER EXPOSED TO THE SOLAR WIND IN SPACE AND RETURNED BY THE CRASH GENESIS SACRAFT HAS SHOWN THAT THE SUN HAS A HIGHER PROPORTION OF OXION SIXTEEN THAN DOES THE EARTH THE MEASUREMENT IMPLIES THAT AN UNKNOWN PROCESS DEPLETED OXYGEN SIXTEEN FROM THE SUN'S DISK OF PROTOPLANETARY MATERIAL PRIOR TO THE COALESCENCE OF DUST GRANS FROM THAT FORM THE EARTH 
question_asr: WHAT MOLECULE DOES THE SUN HAVE IN HIGHER PROPORTION THAN EARTH 