Astronomy & Earth Motions Test 2 Flashcards
Star trails
streaks of star light on a time exposure photograph as earth rotates
Right side of the moon is illuminated
when full moon is approaching
left side of the moon is illuminated
after full moon
waxing
new
waning
old
Blue moon
2nd full moon of the month
The big bang theory
13.7 billion years ago all matter in the universe exploded
The Doppler effect
sound going from low to high to low
low pitch
long
high pitch
short
sound approaching
shorter –> higher pitch
sound moving away
longer –> lower pitch
earthshine
seeing the “dark side” of the moon * only new crescent or old crescent
Tides
highest range : new moon, full moon
What causes tides?
gravity of moon and sun
Light year
distance light travels in one year
Light travels at
186,282 miles/second
the moon is about ____ light seconds away
1.2
the sun is about ___ light minutes away
8.5
1 light year takes
4,000 years
our solar system is at a
spiral arm