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The nearest known quasar, Markarian 231, is about 581 million light-years from Earth, [129] while others have been discovered as far away as UHZ1, roughly 13.2 billion light-years distant. [ 130 ] [ 131 ] Quasars are noteworthy for providing the first demonstration of the phenomenon that gravity can act as a lens for light .
The impact would have released enough energy to liquefy both the ejecta and the Earth's crust, forming a magma ocean. The liquefied ejecta could have then re-accreted into the Earth–Moon system. [53] [54] The newly formed Moon would have had its own magma ocean; its depth is estimated from about 500 km (300 miles) to 1,737 km (1,079 miles). [53]