000			03121cam a22004215i 4500
999			_c33217 _d33217
001			21313318
003			OSt
005			20230918155949.0
008			191126t20192019nyua b 001 0 eng d
010			_a 2019286956
020			_a9780062657923 _q(hardcover)
020			_a0062657925 _q(hardcover)
035			_a(OCoLC)on1091131580
040			_aTOH _beng _cTOH _erda _dPX0 _dFM0 _dOCLCF _dOQX _dVP@ _dUAP _dDLC
042			_alccopycat
082	0	4	_a523.4 _223
100	1		_aAsphaug, Erik, _eauthor. _998744
245	1	0	_aWhen the Earth had two moons : _bcannibal planets, icy giants, dirty comets, dreadful orbits, and the origins of the night sky / _cErik Asphaug.
250			_aFirst edition.
264		1	_aNew York, NY : _bCustom House, _c[2019]
264		4	_c©2019
300			_axii, 356 pages : _billustrations ; _c24 cm
336			_atext _btxt _2rdacontent
336			_astill image _bsti _2rdacontent
337			_aunmediated _bn _2rdamedia
338			_avolume _bnc _2rdacarrier
504			_aIncludes bibliographical references (pages [305]-344) and index.
505	0		_aRuined structures -- Rocks in a stream -- Systems inside systems -- Strange places and small things -- Pebbles and giant impacts -- The last ones standing -- A billion earths.
520			_aAn astonishing exploration of planet formation and the origins of life by one of the world's most innovative planetary geologists. In 1959, the Soviet probe Luna 3 took the first photos of the far side of the moon. Even in their poor resolution, the images stunned scientists: the far side is an enormous mountainous expanse, not the vast lava-plains seen from Earth. Subsequent missions have confirmed this in much greater detail. How could this be, and what might it tell us about our own place in the universe? As it turns out, quite a lot. Fourteen billion years ago, the universe exploded into being, creating galaxies and stars. Planets formed out of the leftover dust and gas that coalesced into larger and larger bodies orbiting around each star. In a sort of heavenly survival of the fittest, planetary bodies smashed into each other until solar systems emerged. Curiously, instead of being relatively similar in terms of composition, the planets in our solar system, and the comets, asteroids, satellites and rings, are bewitchingly distinct. So, too, the halves of our moon. In When the Earth Had Two Moons, esteemed planetary geologist Erik Asphaug takes us on an exhilarating tour through the farthest reaches of time and our galaxy to find out why. Beautifully written and provocatively argued, When the Earth Had Two Moons is not only a mind-blowing astronomical tour but a profound inquiry into the nature of life here -- and billions of miles from home.
650		0	_aPlanetary science. _998745
650		0	_aLife on other planets. _998746
650		0	_aAstronomy _vPopular works. _917313
650		0	_aPlanets _xOrigin. _998747
650		7	_aPlanets _xOrigin. _2fast _0(OCoLC)fst01065159 _998747
906			_a0 _bibc _ccopycat _d2 _encip _f20 _gy-gencatlg
942			_2ddc _cANF _03