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What factors change density?
- Pressure ++ or --
- Temp +- or -+
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Hypothesis?
An educated guess
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Therory?
An explanation based on evidence
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Isotope?
An atom with uneven amounts of protons and neutrons
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Ion?
An atom with uneven amounts of protons and electrons
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Electromagnetic Spectrum?
*R,M,I,V,U,X,G
- Radio
- Microwave
- Infrared
- Visible Light
- UV
- X-ray
- Gamma Ray
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Formation of the Solar System
- 1. nebula collapsed
- a near by star explodes
- two nebulas collide
- 2. the nebula flatens, spinns, and gets hoter
- 3. the gas and dust inside collide, makeing planetesimals
- 4. the planetesimals collide to make planets
- 5. the sun is formed by nuclear fusion
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How are distances in pace measured?
- Light Year - the distance it light goes in a year
- Astronomical Unit (AU) - the distance between the Earth and the sun
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Parallax?
A change in position
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Nuclear Fusion?
When two hydrogen nuclei combine to form a helium and energy
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Law of Universal Gravitation
- Every thing has gravity, G=M*D
- Mass up, gravity up
- Distance up, Gravity down
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Planetary Motion
- 1. Planets travel in an ellipticle orbits (__)
- 2. A planet moves faster when it is closer to the sun
- 3. A planet that is closer to the sun moves faster than a planet farther way
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Perihelion and Aphelion
- Close to the sun
- Far from the sun
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Formation of the Earth?
- 1. a lumpy planetesimal is formed
- 2. it gravity makes it a perfect spere
- 3. it became cooler
- 4.
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Formation of the Moon?
- 1. mars sized object hit Earth
- 2. debris ejected
- 3. gravity pulled it into a ball and into orbit
Evidence- scientists foung thr same meterials in the moon and the earthe mantle
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Waxing and Waning?
- Getting bigger moon on right
- Getting smaller moon on left
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Types of Tides?
- Neap tides- Small diference in high and low tides, during quarters
- Spring tides- Great diference in high and low tides, during full and new moons
Reason- the moons gravitational pull
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Perigee and Apogee?
- Moon is closest to earth
- Moon is farthest from earth
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Seasons?
Reason- the tilt of the earth (23.5)
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Season Dates?
- North gets most sun on the Summer Solstice (June 21)
- North gets least sun on the Winter Solstice (Dec 21)
- After winter when the South and North get the same sun it is the Vernal Equinox (Mar 21)
- After summer when the South and North get the same sun it is the Autumn Equinox (Set 21)
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