Theories of the universe 

==Big bang theory== is $the leading explanation on how the universe began. All matters was compacted into a hot, dense, tiny ball called singularity.$

==Steady state universe theory== proposed that $the universe has been present ever since and therefore has no beginning and has no end.$

==Oscillating universe theory==, $another Bigbang will occur when the universe starts to run down.$

==Nebular hypothesis or planetesimal theory== as $gas swirled around, Eddie's of gas caused the formation to run down$

$Fission theory bursting of sun sent out planets$

Capture theory planets and moons were wandering around and were captured by the sun.

==Accretion theory== $small chunks materials gradually combined and formed earth, then more chunks formed the moon.$

==Planetary collision theory== $earth collided with small formed the planets and moons$

==Stellar collision theory== $two stars collided with a small planet producing the moon$

==Gas cloud theory== $gas cloud is pulled by sun's gravity, the formed into planets and moons.$