astronomy review Flashcards
(43 cards)
nutation
wobble of earth’s TILT
precession
wobble of earth’s AXIS
kepler’s first law
planets orbit in an ellipse
kepler’s second law
planets move fastest when they’re closer to the sun
kepler’s third law
as a planet gets farther away from the sun, it’s revolution increases
aphelion (APART)
when earth is further away from the sun
perihelion
when earth is closer to the sun
why do we only see one side of the moon?
because the lunar day and the lunar moon is the same amount of time
waxing
getting bigger
waning
getting smaller
what would happen if the earth wasn’t tilted on an axis?
more constant climate, no seasons
what would happen if earth didn’t rotate?
no day / night
barycenter
center of gravity, center of mass between two unalike objects
spring tides (SUPER)
-when the sun, moon, and earth are in alignment
-highest high tides, lowest low tides
-new moon, full moon
neap tides
-when the moon, earth, and sun are at a right angle
-most mild tides (both high and low)
-first and third quarter
where is the magnetic force strongest?
near the poles
what is the purpose of earth’s magnetic field?
to protect earth from the sun’s harmful radiation
what are auroras?
interactions between charged particles from the sun and earth’s magnetic field
what is electromagnetic energy arranged according to?
wavelength
radio waves
longest wave length, lowest frequency, radio stations
microwaves
cell phones, microwave ovens
infrared waves
heat waves given off by warm bodies / objects
visible light
white light is a mix of light waves ith different wave lengths
ultraviolet waves
energy from the sun, sunburns
