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Vocabulary
Galaxies and Stars
The Planets
The Lunar Cycle, Tides, and Seasons
Small Bodies in Our Solar System
100
the average distance between the Earth and the Sun
What is an astronomical unit?
100
where stars form
What is inside a stellar nebula?
100
dense, rocky, planets closest to the Sun (the inner planets)
What are the terrestrial planets?
100
when the sunlit part of the moon appears to be getting bigger each night
What is waxing?
100
dirty-snowballs made of ice-rock and dust that orbit the Sun in an ellipse
What is a comet?
200
when the shadow of one celestial body falls on the surface of another
What is an eclipse?
200
As temperature of a star increases, luminosity _________________.
What is increases?
200
the amount of time it takes a planet to spin once on its axis
What is period of rotation?
200
when the sunlit part of the moon appears to be getting smaller each night
What is waning?
200
a small, rocky body that orbits the Sun between Mars and Jupiter
What is an asteroid?
300
the counterclockwise spin of a body as seen from its North Pole
What is prograde rotation?
300
the coolest stars are this color
What is red?
300
the amount of time it takes a planet to orbit the Sun one time
What is period of revolution?
300
this causes the ocean tides
What is the gravitation pull of the moon causes Earth's water to bulge outward?
300
probably small pieces of an asteroid
What is a meteoroid?
400
natural or artificial bodies that revolve around larger bodies
What are satellites?
400
the force that holds all the stars, gas, and dust together in a galaxy
What is gravity?
400
the largest planets with deep, massive atmospheres that are far from the Sun (the outer planets)
What are the Gas Giants?
400
Sun, Moon, and Earth are aligned causing very strong tides
What is a Spring tide?
400
the bright streak of light caused by a meteoroid entering Earth's atmosphere
What is meteor?
500
the clockwise spin of a body as seen from above its North Pole
What is retrograde rotation?
500
the three types of galaxies
What are spiral, elliptical, and irregular?
500
this is why the surface temperature of Venus so much hotter than the other planets
What is a runaway greenhouse effect?
500
this cause some parts of the Earth to experience different seasons
What is the tilt of Earth's axis?
500
a meteoroid that strikes Earth's surface
What is a meteorite?