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God's Great Universe Chapter 4
The Universe
68
Science
6th Grade
02/25/2013

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Term
Astronomy
Definition
The study of the stars, planets, and all other heavenly bodies.
Term
Astronomers
Definition
Scientists who study outer space, try to understand what stars,planets, and all other heavenly bodies are like and what affect they have on each other.
Term
Atmosphere
Definition
layers of air surrounding the Earth
Term
Exosphere
Definition
The top most region of the atmosphere where there is little to no air.
Term
Vacuum
Definition
An area containing no air or any other matter, space is almost a vacuum.
Term
Friction
Definition
the force that resists motion, because there is no air in space, there is no friction caused by air either.
Term
extremes in temperature
Definition
In space you would need a space suit to protect you from extremes in temperature(over 200 degrees in the sunlight and well below 0 degrees in the shade)-on Earth the atmosphere shields us from extreme heat and insulates us from extreme cold.
Term
galaxy
Definition
a star system containing from millions to billions of stars
Term
Milky Way
Definition
the galaxy we live in
Term
Local Group
Definition
Our galaxy, the Milky Way, is one of 40 galaxies grouped in a cluster known as the Local Group
Term
Andromeda galaxy
Definition
this galaxy is visible with the naked eye on a dark night
Term
The three galaxies closest to ours
Definition
Sagittarius Dwarf galaxy,

Large Magellanic Cloud,(visible with naked eye in the Southern Hemisphere)

Small Magellanic Cloud(visible with naked eye in the Southern Hemisphere)
Term
Supercluster
Definition
our Local Group of galaxies is part of a larger group known as a supercluster
Term
Spiral Galaxies
Definition
the Milky way and the Andromeda galaxy look like giant pinwheels and are called spiral galaxies
Term
barred spirals
Definition
some spiral galaxies look like the spiral arms are attached to a straight "bar" that runs through the center of the galaxy
Term
Elliptical galaxies
Definition
when viewed from the side these galaxies resemble eggs or footballs; some elliptical galaxies are almost spherical. Compared to spiral galaxies,elliptical ones are not as structured and do not contain as much free gas or dust.
Term
Irregular galaxies
Definition
Galaxies composed of stars clumped together in no definite shape
Example: Large Magellanic Cloud and the Small Magellanic Cloud
Term
Nebulae
Definition
In addition to stars, many galaxies contain nebulae- large clouds of gas and dust floating in space.
Term
Constellation
Definition
the stars outlining an imaginary picture are called a constellation, many have names that have been used since ancient times.
Term
Polaris
Definition
the North Star or the Pole Star

Seen in the Northern Hemisphere- certain constellations appear to revolve around the North Star. The North Star does not appear to move in the sky because it is located directly above the northern end of the earth's axis of rotation
Term
Axis of Rotation
Definition
an imaginary line that stretches from pole to pole through the interior of the earth, around which the earth rotates
Term
Spring Constellations
Definition
constellations that can be seen in the early evening during spring
Term
Autumn Constellations
Definition
constellations that can best be viewed in the autumn
Term
The Great Bear
Definition
constellation in the north sky also called : Ursa Major

this constellation contains the Big Dipper- to find the North Star imagine a straight line drawn through the two outer stars in the dipper's bowl(known as Pointers)
Term
The Little Bear
Definition
the constellation that contains Polaris or the North Star...

also called Ursa Minor or more commonly called Little Dipper
Term
Queen Cassiopeia
Definition
constellation named after a mythical queen of Ethopia
Made of five bright stars that really look like a huge M or W.
Term
King Cepheus
Definition
five-sided constellation named after Cassiopeia's husband
Term
The Lady in Chains
Definition
According to mythology, Cassiopeia and Cepheus had a daughter named, Andromeda.
Her beauty made others jealous, so she was chained to a rock to be devoured by a huge whale. The stars in Andromeda seem to depict a lady bound with a chain. Near Andromeda's knee is the Andromeda galaxy. The whale below her is too far below the horizon for us to see him.
Term
The Great Square
Definition
not a constellation itself, but a group of stars in the constellations of Andromeda and Pegasus
Term
The most distant object that can be seen with the naked eye
Definition
The Andromeda Galaxy found near the knee of the Andromeda(the lady in Chains) constellation
Term
Perseus
Definition
constellation depicting Perseus the mythical hero who killed the whale saving Andromeda and later married her.
The brightest star in this constellation is Algol which is actually two stars or a binary star.
Term
Pegasus
Definition
the flying horse of Greek mythology Three stars in the Great Square make up the horses wing
Term
Leo, the Lion
Definition
Regulus is the brightest star in Leo and marks one of the lion's front paws
Term
The Sickle
Definition
the outline of the lion's head in the constellation Leo--- makes the shape of a sickle
Term
The Swan
Definition
also called Cygnus
the brightest star is called Deneb
Term
The Twins, Gemini
Definition
Gemini resembles twin brothers holding hands
brightest star: are Castor and Pollux
the heads of the two boys
Term
The Dragon
Definition
Draco, the Dragon Constellation
the long tail of the dragon curves around the Little Dipper
Term
The Hunter,Orion
Definition
the brightest of all the constellations
one hand holds a shield, the other hand raises a club- a bright sword hangs by his side
Brightest stars are Betelgeuse- his right shoulder, and Rigel -his left foot
The glow among Orion's sword is known as the Great Nebula
Term
Great Nebula
Definition
Glow of gas and dust surrounding the stars of Orion the Great Hunter's Sword.
Term
The Bull, Taurus
Definition
His eye, the large orange star, Aldebaran, is red with rage- but he retreats before the shield of Orion the hunter
Has the star cluster known as Pleiades at the tip of one of it's horns
Term
The star cluster, Pleiades
Definition
located at the tip of one of it's horns in the constellation, The Bull, Taurus
The Pleiades are mentioned in Job 9:8-9 and 38:31 and in Amos 5:8
Term
The Big Dog, Canis Major
Definition
stands below and to the east of Orion the Hunter-- appears to accompany him

Brightest star named Sirius (the brightest star in the night sky)
Term
Sirius
Definition
The brightest star in the night sky, in the constellation Canis Major, the Big Dog
Term
The most important star to Earth
Definition
the Sun
Term
the gases that mainly make up the Sun
Definition
hydrogen and helium
Term
the largest object in the solar system
Definition
the sun
Term
distance the sun is from the Earth
Definition
93 million miles
Term
the hottest region of the sun the center
Definition
Sun's Core
Term
the suns visible surface also called the "sphere of light"
Definition
photosphere
Term
patches of gas that are cooler than the rest of the sun and therefore not as bright
Definition
sunspots
Term
actual brightness of a star- how much light the star produces
Definition
absolute magnitude
Term
by contrast, the apparent brightness of a star as seen from the earth
Definition
apparent magnitude
Term
the apparent magnitude of a star depends on 2 things
Definition
actual brightness and distance from the earth
Term
optical double
Definition
A pair of stars that appear very close together from our perspective on the earth but which are actually far apart
Term
nova
Definition
An occurrence where a star will suddenly flare up to many times its original brightness
Term
supernova
Definition
In contrast to a nova which leaves the star unharmed, a supernova is the actual explosion of a star
Term
solar wind
Definition
A faint "wind" of high-speed gas particles that stream into space from the sun's corona
Term
sunspots
Definition
Dark patches on the sun's surface caused by the sun's magnetic field
Term
photosphere
Definition
The sun's visible surface
Term
corona
Definition
The hottest region of the sun's atmosphere, extending hundreds of thousands of miles from the sun's surface
Term
core
Definition
The hot central part of the sun
Term
solar flare
Definition
Tremendous bursts of energy caused by sudden changes in the sun's magnetic field
Term
light years
Definition
Unit used to measure giant distances, such as the distances between the stars; equal to about 5.9 trillon miles
Term
93 million
Definition
How far is the sun from the earth?
Term
absolute is the true brightness apparent is the apparent brightness
Definition
what is the difference between absolute magnitude and apparent magnitude?
Term
0
Definition
Which is brighter, a star with a magnitude of 0, a star with a magnitude of 1.5 or a star with a magnitude of 6?
Term
binary
Definition
A Group of two stars that circle around each other
Term
solar prominence
Definition
Huge loops of cooler gas erupting thousands of miles from the chromosphere that are suspended in space by the sun's magnetic field
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