 In between the stars in a galaxy, there are clouds of hydrogen gas and dust called nebula.

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Presentation transcript:

 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 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  = sec = 1.27 min

▪ (i)nebula ▪ (ii)spiral and elliptical galaxies ▪ (iii)giant stars ▪ (iv)dwarf stars ▪ (v)quasars ▪ (vi)black holes

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