nebular hypothesis theory (gld)
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Nebular Hypothesis TheoryNebular Hypothesis Theory
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What is a Theory?What is a Theory?
A theory is both a goal and a tool of A theory is both a goal and a tool of researchresearch
Theories ask the questions that look Theories ask the questions that look beyond the facts and laws of sciencebeyond the facts and laws of science
Theory statements can be refuted, but not Theory statements can be refuted, but not verified, no matter how strongly we believe verified, no matter how strongly we believe in the truth of a theory. It is always in the truth of a theory. It is always possible for it to be falsified. possible for it to be falsified.
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Nebular Hypothesis TheoryNebular Hypothesis Theory
The birthplace of our solar system was a The birthplace of our solar system was a NEBULANEBULA– A nebula is a “fuzzy” patch in the sky, either A nebula is a “fuzzy” patch in the sky, either
light or dark; a cloud of gas and dustlight or dark; a cloud of gas and dust– Our solar system evolved from a swirling Our solar system evolved from a swirling
cloud of dust (cloud of dust (Nebular Theory)Nebular Theory)– Gravity caused the gases and dust to be Gravity caused the gases and dust to be
drawn together into a denser cloud (rate of drawn together into a denser cloud (rate of rotation increased)rotation increased)
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Nebular Hypothesis Theory cont.Nebular Hypothesis Theory cont.
– As a result the cloud collapsed to resemble As a result the cloud collapsed to resemble a disk. Most of the mass collapsed in the a disk. Most of the mass collapsed in the centercenter
– Matter in the rest of the disk clumped Matter in the rest of the disk clumped together to form planetesimals = together to form planetesimals = protoplanetary bodiesprotoplanetary bodies
– Hydrogen gas combined or fused to form Hydrogen gas combined or fused to form helium atoms (nuclear fusion – a source of helium atoms (nuclear fusion – a source of energy from the sun!)energy from the sun!)
The Sun was born!!!The Sun was born!!!
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Examples of NebulasExamples of Nebulas
Eagle NebulaEagle Nebula
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One last exampleOne last example
Cats Eye NebulaCats Eye Nebula
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Examples of NebulasExamples of Nebulas
Orion NebulaOrion Nebula– Located in the Located in the
constellation Orionconstellation Orion
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Our solar systemOur solar system
Terrestrial planets: Terrestrial planets: inner part of solar inner part of solar systemsystem
Characteristics: small Characteristics: small and rockyand rocky– MercuryMercury– VenusVenus– EarthEarth– MarsMars
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Our solar systemOur solar systemGas giants: larger planetsGas giants: larger planetsCharacteristics: colder and covered with Hydrogen (gas & liquid)Characteristics: colder and covered with Hydrogen (gas & liquid)– JupiterJupiter– SaturnSaturn– UranusUranus– NeptuneNeptune
Pluto: no longer considered a planet but still there!!!Pluto: no longer considered a planet but still there!!!
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Planets (continued)Planets (continued)
Rotation is how long it Rotation is how long it takes for a point on takes for a point on planet to spin around planet to spin around and face the sunand face the sun– Length of dayLength of day
Revolution is how Revolution is how long it takes a planet long it takes a planet to go around the Sun; to go around the Sun; also known as orbitalso known as orbit– Length of yearLength of year
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Other stuff in the solar systemOther stuff in the solar system
CometsCometsAsteroidsAsteroidsMeteoroidsMeteoroidsGasGasDustDustSatellitesSatellitesSpace “Junk”Space “Junk”Can you think of Can you think of anything else?anything else?
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Comets – Halley’s Comet – 76 yrs 2052Comets – Halley’s Comet – 76 yrs 2052– Mixtures of frozen gases, ice and rocky debrisMixtures of frozen gases, ice and rocky debris– Outer solar systemOuter solar system– Looping orbits bring close to the Sun, ice melts thus having Looping orbits bring close to the Sun, ice melts thus having
streaming tailsstreaming tails
AsteroidsAsteroids– Dark, rocky bodies that orbit the SunDark, rocky bodies that orbit the Sun
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Milky Way GalaxyMilky Way Galaxy
Swath of light formed Swath of light formed by the glow of billions by the glow of billions of starsof starsFlat spiral collection Flat spiral collection of starsof starsLargest celestial Largest celestial featurefeatureFormed 10 billion Formed 10 billion years agoyears ago
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Other GalaxiesOther Galaxies
Whirlpool Galaxy Andromeda Galaxy
Sombrero Galaxy Large Magellanic Cloud
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Created by:-Created by:-
PRABHAT RAUSHANPRABHAT RAUSHAN