Mr. Peterson, Science.  Helpful when working with small numbers…  Mass of an electron = 0.00000000000000000000000000000091 kg  Much easier to write.

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Presentation transcript:

Mr. Peterson, Science

 Helpful when working with small numbers…  Mass of an electron = kg  Much easier to write 9.1 x kg  Examples  =  = 1.7 x x 10 -5

 Helpful when working with large numbers…  Mass of the Sun = 2,000,000,000,000,000,000,000,000,000,000 kg  Much easier to write 2 x kg  Examples:  6,700,000 =  3270 =  475,000 = 6.7 x x x 10 5

 A galaxy is a large group of stars, gas, and dust held together by gravity.  A galaxy can contain millions to trillions of stars.  There are about a billion galaxies in the universe.

 Our solar system is in the Milky Way Galaxy.  Spiral Galaxy  Top view

 Milky Way Galaxy – Spiral Galaxy  Side view

 Elliptical Galaxies  Irregular Galaxies

Spiral GalaxyElliptical GalaxyIrregular Galaxy 20%60%20% Mass – SunMass 10 6 – SunMass 10 9 Sun 5-50 kpc1-200 kpc1-10 kpc Young and old starsOld starsYoung and old stars Milky Way Galaxy (Spiral) mass = Sun size = 30 kpc (30,000 pc or 97,000 light years)