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Embed code for: Galactic Cloze Notes
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Galactic Notes Sheet (Notes)
Classification of Galaxies:
Galaxies come in ____________, _____________, _____________, and ___________. Clusters of galaxies also exist.
The three broad categories of galactic shapes are:
___________ (E), ___________ (S), ___________(Irr)
Spirals are subdivided into two types: ________________ (S) and _____________ _______________ (SB)
Barred spiral (SB)
About _______ of all spirals are barred spirals, in which the arms terminate at the ends of a central bar, rotating as a unit.
More than _________ of the brightest, most conspicuous galaxies are spirals
About ________ are irregulars, and the rest are ______________.
In the universe as a whole, ______________ galaxies are far more numerous.
The Milky Way
A giant spiral galaxy of billions of stars, including our ________________.
An immense _________-_________ object, far larger than most of the galaxies in its immediate neighborhood.
Its true ___________, ___________, and ___________ have only been discovered by astronomers in the 20th century.
Its visible disk has a diameter of approximately _____________ light-years and a height above its principal plane of about __________ light-years, although some kinds of objects, such as _____________ ___________, extend much farther above the galactic plane.
The Galaxy's mass is possibly ___________ to ___________ billion times the mass of the Sun. As the Sun's mass is about average for a star in the Galaxy, the total number of stars must also be of this order.
The Sun lies a little more than __________ light-years from the ____________ of the Galaxy.
Local Group of Galaxies
The area around our Galaxy is populated by other galaxies that make up a small cluster called the ______________ _________________.
The LOCAL GROUP OF GALAXIES contains ________ known members and is spread out over a region about _______ million light-years in diameter.
Most of these neighbors, such as the _______________ ______________, are far smaller and less luminous than the Galaxy.
The only other large galaxy is the _______________ _____________, which is more than 2 million light-years away, is somewhat larger and more luminous than our own galaxy and is visible to the naked eye.
The Local Group is near the edge of a supercluster of galaxies, revolving in its center at about ________ km/sec (240 mi/sec).
The supercluster, which has a diameter of about 130 million light-years, also contains the great _____________ cluster of about _____________ galaxies.
Evidence exists that the supercluster itself may in turn be part of a much larger supercluster of tens of thousands of galaxies called the "______________ ____________."