collide ⪢⪢
http://qindex.info/i.php?x=12642
 collide ⪢⪢
http://qindex.info/i.php?x=19314
○○○ nebula ⪢⪢
The solar system came into being about 4.5 billion years ago when a cloud of interstellar gas and dust collapsed resulting in a solar nebula, a swirling disk of material that collided to form the solar system.
http://qindex.info/i.php?x=11710
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