Our Solar System
___________ planets are made of rocks and have iron cores, just like Earth.
Terrestrial
Earth completes one ________, or one complete turn, every 24 hours.
Rotation
What is an object that emits energy in the form of light and heat?
Star
What theory states that our universe began around 14 billion years ago from a single point smaller than an atom?
The Big Bang Theory
What galaxy does Earth belong to?
The Milky Way
What are huge chunks of irregularly shaped rocks mostly located between Mars and Jupiter?
Asteroids
Earth makes one __________, or one full circle around the sun, every 365 days.
Revolution
A ______ is a large cloud of gas and dust.
Nebula
The change in perceived frequency of a wave is called the _______ _____.
Doppler Shift
What are the 4 inner planets?
Mercury, Venus, Earth, Mars
______ are made of dust, rock particles, frozen gases, and ice that are orbiting the sun.
Comets
What are the days that Earth is most tilted toward the sun called?
Solstices
The shapes and pictures people see in the starry night sky are called ______________.
Constellations
_______ causes planets to stay in orbit around the sun.
Gravity
What are the 4 outer planets?
Jupiter, Saturn, Uranus, Neptune
What's the difference between a meteoroid, a meteor, and a meteorite?
Meteoroid = a piece of space dust or rock
Meteor = a meteoroid burning as it enters the earth's atmosphere
Meteorite = when a meteor strikes Earth
Earth is not tilted toward or away from the sun on ________.
Equinoxes
What are the 4 layers of the sun?
Core, Radiative Zone, Convective Zone, Atmosphere
Who published a paper saying that Earth and all other planets revolved around the sun?
Nicolaus Copernicus
What do you call anything that revolves around a planet or other object?
A Satellite
Because objects in space are so far apart, scientists use _____-_____ to measure distances in space.
Light-Years
A _____ _______ happens when the moon is between Earth and the sun, and a _____ _______ is when Earth is between the sun and moon.
Solar Eclipse, Lunar Eclipse
What are huge groupings of stars, gas, and dust?
Galaxies
How did ancient Greek philosophers perceive our solar system?
They believed Earth was at the center of the solar system.
How long does it take the moon to complete all eight phases of a Lunar Cycle?
29.5 days