hi Flashcards
satilight
an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
planet
an object that orbits the sun
meteor
a streak of light produced when a small object burns up entering the earths atmosphere
comet
a cold mixture of dust and ice that gives off a long trail of light as it approaches the sun
star
a giant ball of hot gas
constallation
a pattern of stars that people imagine to represent a picture figure or object
axis
the imaginary line that runs through the north and south poles
rotation
the spinning of the earth on its axis
revolution
the movement of one object around another
orbit
earths path
calendar
a system of organizing time that defines the beginning, length and divisions of a year
solctice
the sun appears farthest north of the equator once a year and farthest south once a year
equinox
halfway between a solstice the sun rises directly over the equator rises due east and sets due west
force
a push or pull
gravity
a force that attracts all object together
mass
the amount of matter in an object
weight
the measure of a force of gravity on an object
density
the degree of compactness of a substance.
phases
the different shapes of the moon
eclipse
when the sun and a third object it casts a shadow
solar eclipse
when the moon passes directly between the earth and the sun
lunar eclipse
when the earth passes directly between the moon and the sun
umbra
the very darkest part of the moon’s shadow
penumbra
the larger part of the shadow
tides
the rise and fall of ocean water that occurs about every 12.5 hours
spring tide
a tide with the greatest difference between low and high tides and the sun and moon pull in the same direction
neap tide
a tide with the lowest difference between high and low tides and the suns pull is at a right angle with the moons
co-accretion
the Moon and Earth were formed together from a primordial cloud of gas and dust.
fission
a fluid proto-Earth began rotating so rapidly that it flung off a mass of…
capture
the earth pulled in a mars sized planet
collision
something crashed into the earth and a piece flew off
