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Transcript
NEBULAR HYPOTHESIS Unit #2 Nebula ⦿ Birthplace of all stars and solar systems ⦿ Interstellar cloud of dust, hydrogen, helium and other ionized gases Beginning of a Solar System ⦿ The gases and dust begin to collapse inward due to gravitational forces ⦿ At the beginning of this collapse we form a SOLAR NEBULA. Solar Nebula ⦿ Rotating cloud of gas and dust from which the sun and planets are formed. Flattening of the solar nebula ⦿ As the solar nebula rotates, it flattens and becomes warmer near the center. ⦿ When the center reaches about 10,000 degrees Celsius (about 18,000 degrees F) and hydrogen fusion begins, a STAR is born. Cooling of Nebular Cloud ⦿ Small particles begin colliding and accreting into small asteroid sized bodies known as PLANETESIMALS. Planetesimals Grow ⦿ As these planetesimals grow, their gravitational pull increases causing more collisions with dust, gas and other planetesimals. Protoplanets are born ⦿ Smaller planetesimals begin to collide with larger ones forming PROTOPLANETS. Solar System Forms ⦿ After millions to billions of years of collisions, the protoplanets grow and evolve into what we know as our PLANETS. Moons/Satellites ⦿ The smaller bodies that orbit the planets are known as MOONS or SATELLITES.
