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Pumping out energy, quasars are one type of object described as the active nuclei of these vast structures |
galaxies
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$2,000 |
DJ |
ASTRONOMY |
2010-10-05 |
#5992 |
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(I'm astrophysicist Neil de Grasse Tyson.) Some with billions, others with trillions of stars, these are the fundamental building blocks of visible matter in the universe; they come in many varieties including spiral, irregular & elliptical |
galaxies
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$800 |
DJ |
ASTRONOMY |
2008-04-15 |
#5442 |
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Hubble studies indicate that these star systems, like the Milky Way, may total 50 billion |
Galaxies
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$400 |
DJ |
ASTRONOMY |
1997-03-27 |
#2904 |
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A common form of these large groupings of stars is a disk with a central bulge |
galaxies
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$800 |
DJ |
ASTRONOMY |
1996-05-16 |
#2709 |
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These star systems like the Milky Way are sometimes referred to as "island universes" |
galaxies
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$300 |
J |
ASTRONOMY |
1993-05-12 |
#2013 |
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Elliptical, irregular & spiral are the 3 main types of these star systems |
galaxies
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$400 |
DJ |
ASTRONOMY |
1991-03-21 |
#1519 |
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The Milky Way is part of a cluster of these called the local group |
galaxies
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$200 |
DJ |
ASTRONOMY |
1989-01-02 |
#1001 |
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Stars & these vast collections of stars are called the building blocks of the universe |
galaxies
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$600 |
DJ |
ASTRONOMY |
1986-10-24 |
#490 |
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From Greek for "milk", a system of stars such as the Milky Way |
galaxies
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$600 |
DJ |
ASTRONOMY |
1984-11-29 |
#59 |