The moon being closest celestial body to the earth is often into research. After the successful landing on moon, now scientists are looking forward to know how moon came to its form. They have arrived at a solution that moon was a product of clash between the earth and a long-hypothesized protoplanet called Theia.

According to researches, moon is 100 million years younger to solar system. The UCLA researchers gave evidence in the journal Science that collision was head-on, which mixed clashing bodies forming the moon. The discussion over nature of blow between the bodies has always given rise to debate.

The researchers, in order to know whether lunar objects are made of same elements that of the earth, researched seven lunar rocks collected during Apollo 12, 15 and 17 missions along with six volcanic rocks comprising material from Earth's mantle. On analyzing ratio of oxygen isotopes in lunar rocks and terrestrial rocks, researchers found that more than 99.9% of oxygen on earth is O-16, which means each atom has eight protons and eight neutrons.

However, the oxygen on earth also comprises small amounts of the heavier isotopes of O-17 and O-18. “Every rock in the solar system we've ever found has a unique fingerprint of oxygen isotopes, we don’t see any difference between the Earth’s and the moon’s oxygen isotopes. They’re indistinguishable”, said Edward Young, a geochemist at UCLA and the first author on the study. Despite the diversity in oxygen isotopes on the moon, the study made clear that the moon and Earth have the exact same oxygen isotope. These findings led to the conclusion that the moon and earth are made of same material.

The results the past study stated was that there was less mixing of the collided body, however, new finding claims that blow was too extreme that moon was a part of large debris formed out of collision. Another expected theory is that the earth and Theia may have similar ratio of oxygen isotope but not identical.