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Chapter 9
Chapter 9 Lessons
33
Astronomy
8th Grade
03/04/2014

Additional Astronomy Flashcards

 


 

Cards

Term
______ Is a cold blue planet: atmosphere contains visible clouds
Definition
Neptune
Term
Geocentric
Definition
Earth Centered Model Of The Solar System
Term
Heliocentric
Definition
Earth and other planets revolve around the sun
Term
Scientists Classify Objects in Space By:
Definition
Size, Shapes, Composition, Orbit
Term
Asteroid Belt
Definition
Region of the solar system betweeen Mars and Jupiter
Term
Kuiper Belt
Definition
Region of the solar system beyond Neptune's orbit
Term
Oort Cloud
Definition
Region of the solar system beyond the kuiper belt
Term
Comet
Definition
Loose Collections of ice, dust, and small rockey particles whose orbits can be very long and narrow
Term
Coma
Definition
Clouds of gas and dust that form a fuzzy layer around a comet
Term
Nucleus
Definition
Solid inner core of a plannet
Term
Asteroid
Definition
Rocky objects; most of which are too numerous to be considered planets and dwarf planets
Term
Meteor
Definition
Streak of light produced when a meteoroid enters the atmosphere of Earth
Term
Meteorite
Definition
Meteoroids that pass through the atmosphere and are found on earths surface
Term
Gas Giants
Definition

4 Outer Planets

 

(Jupiter, Saturn, Uranus, Neptune)

Term
The 4 Outer Planets are much _______ and more _______ than Earth, and they dont have solid surfaces
Definition
Larger; Massive
Term
Ring
Definition
This disk of small particles of ice and rock
Term
Jupiter is the ______ and the most massive planet
Definition
Largest
Term
________ has the most spectacular rings of any planet
Definition
Saturn
Term
_______'s axis of rotation is tilted at an angle of about 90 Degrees from the vertical
Definition
Uranus
Term
One day is the time it takes a planet to rotate on its ____
Definition
Axis
Term
Scientists think the solar system formed about how long ago?
Definition
4.6 Billion Years Ago
Term
The Sun Is A ____
Definition
Star
Term
Planetismals collided, stuck together, and eventually combined to form all the objects in the______ _________
Definition
Solar System
Term
Scientists use the __________ _____ to measure distances in the solar system
Definition
Astronomical Unit
Term
About 99.5% of the mass of the solar system is contained within the ___
Definition
Sun
Term
All but two planetsin the solar system have a natural sattelite or ____
Definition
Moons
Term
The four outermost planets in the suns orbit are mostly made up of liquid and ___
Definition
Gas
Term
_______, once the ninth planet in the solar system, is now considered a dwarf planet
Definition
Pluto
Term
The solar system began to form as ________ pulled rock, ice, and gas together
Definition
Gravity
Term
The collision ring theory seems best to describe how
Definition
The moon was formed
Term
At the moons equator, daytime and nighttime temperatures range from
Definition
130 Degrees = -170 Degrees
Term
At 3476 km, the moon's diameter is slightly less than the distance across the ________ _______
Definition
United States
Term
Craters were caused by the impact of ________
Definition
Meteoroids
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