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In between the stars in a galaxy, there are clouds of hydrogen gas and dust called nebula Our Sun and solar system were probably formed from one of these Nebula. The two most accepted theories of how this occurred are: Stellar Collision Theory Nebular Hypothesis Our Sun and the planets were spun off from collisions between stars believed to be more likely, from our observations of other star systems that the Sun and planets formed when a large nebula condensed and collected together by gravity Distances to most stars from Earth are in the millions of A.U.s Light Year It is the distance that light, which moves at 300 000 km/s, travels in a year. It is equal to about 9.5 trillion km. Moon takes about 1.3 s The Sun takes 8 min Jupiter takes 41 min Alpha Centauri light takes 4.3 years Polaris 430 years Andromeda galaxy of 2.5 million light-years 227,939,100 km ÷ 300,000 km/sec = 75.997 sec = 1.27 min ▪ ▪ ▪ ▪ ▪ ▪ (i)nebula (ii)spiral and elliptical galaxies (iii)giant stars (iv)dwarf stars (v)quasars (vi)black holes