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astrophysics (Gravitation ("Something" that held the planets in…
astrophysics
Gravitation
"Something" that held the planets in their statety orbit was a force
perturbation- the objects themselves all exert gravitational force on each other
F1=F2=G
(M1
M2)/R²
F=m
V²/r=M
a
Astronomical unit
1AU=mean distance from center of earth to center of sun=149.6million km
1nm=10(-9)m
a light year=9.4608*10(15)m
the law of area -equal areas at equal time
the law of periods
the law of orbit-ellipical orbits sun at force
planets
are categorized according to composition and size
small rocky planets
Venus
brightest object, sunlight, maximum surface, 225days to complete an orbit
Earth
living organisms, 71%water
Mercury
mercury has a revolution period of 88-days. extreme temperature. fluctuations ranging from 800F to -270F
ice is protected from sun
Mar
ice caps, largest volcano, red, two moons , two years
Gas giant
Saturn
hydrogen and helium, rings ice, 18 known moons, 30 years
Uranus
Blue, methone gas, 11 dark rings , 21 known moons ,
Jupiter
largest, most massive, 11 time bigger than the Earth , 16 known moons
Neptune
Fastest, 2000km/h, blue color, methane gas, 8 moons
moon
29 days , no water no atmosphere, light from sun, dust and rocky debris
asteroid
comets
comets are irregular object a few kilometers across comprising frozen gases rock and dust
sun
big bang theory
evidence
red-shifted
cosmic microwave
lenses