Scientists Think that Earth Had Two Moon

The moon’s back side is very different than its visible side. Back side of the moon, in contrast to the relatively flat near side, covered with numerous hills and craters. Martin Jutzi from the University of Bern (Switzerland) and his colleague Erik Asphaug of the University of California at Santa Cruz (USA) proposed a new explanation for such features of back side of the moon, so according to their assumption its relief could be “remnants” of the second satellite of the Earth, emerged at the same time with Moon and crashed into it after a few tens of millions of years. Scientists have suggested that our moon was born from massive amounts of debris left over from a giant impact Earth suffered from a Mars-size body early on in the history of  the  solar  system. 

Spare rubble might also have coalesced into another companion moon, one just 4 percent its mass and about 750 miles wide, or one-third of our moon’s diameter. Scientists believe that their findings can be tested in practice, if mankind be able to collect and deliver to Earth samples of lunar soil from its back side. Comparison of soil from the visible and the back side will show how different the age of rocks, in case if the hypothesis Yuttsi and Asphoga is true, then rocks of back side will be much older than the soil of the visible side.
source:www.space.com