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Objects in the Sky


axis An imaginary line going straight through the planet between the North and South poles. The Earth rotates on its axis.
season One of four quarters into which a year is commonly divided.
tilt To move or shift so as to slant or tip.
dependent variable Data that changes its value according to the value of the other data that is being compared.
graph A visual way to organize data.
line graph A graph that uses lines to connect points in order to show data.
independent variable Data that does not change and whose value determines the value of the dependent variable.
x-axis The horizontal line on the graph that represents the independent variable.
y-axis The vertical line on the graph that represents the dependent variable.
calendar A way of dividing time into days
month The amount of time it takes the moon to orbit the Earth. About 29 days.
orbit To move completely around another object.
year The amount of time it takes the Earth to orbit the sun. About 364.25 days.
revolution The completion of one orbit around a center. The Earth completes one revolution around the sun in one year.
revolve To move in an orbit around a center.
rotate To turn about an axis or center
rotation The completion of one spin or turn around an axis. The Earth completes one rotation in a day.
new moon The moon is located between the sun and the Earth. The dark side of the moon is facing the earth so a new moon is seldom visible from Earth.
first quarter moon The moon has completed the first quarter of it its trip around the Earth. Sometimes called half moon. Seen 6-8 days after new moon.
full moon The Earth is located between the sun and the moon. The reflection of the sun off of the moon is visible to Earth.
lunar eclipse Occurs when the Earth comes directly between the sun and the full moon
solar eclipse Occurs when the new moon comes directly between the sun and the Earth
gravitational pull The force of gravity that pulls objects toward one another.
gravity A force by which one object pulls on another object.
neap tide Occurs when the sun and moon are at right angles to each other during the first and fourth quarter moons. The sun's pull and moon's pull are not combined and form tides with the least difference between high tide and low tide.
spring tide Occurs when the sun
tide The rise and fall of the water level of the oceans caused by the moon's gravitational pull on the Earth.
atmosphere of planets The mass of air that surrounds the planet. It is a mixture of gases.
atmosphere of Earth A combination of nitrogen
dwarf planet A celestial body that is round and orbits the sun. Dwarf planets are not large enough to have sufficient gravity to clear the path of their orbits.
planet A celestial body that is round and orbits the sun. Planets are large enough to have sufficient gravity to clear the path of their orbits.
relative distance The comparison of the distances between different objects.
scale A ratio between sets of measurements.
solar system The sun and the objects (planets
heat energy Energy transferred from a warmer to a colder object due to their differences in temperature.
asteroids Metallic
comets Large bodies of rock and ice that orbit the sun in a long narrow ellipse. They form a tail when they get close to the sun.
constellations Groups of stars that form patterns.
stars Large luminous bodies that have a large gravitational pull. Earth's sun is a star.
Created by: jr12davis



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