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FCAT 2.0 8th grade Science Review - Aventura Waterways K
FCAT 2.0 8th grade Science Review - Aventura Waterways K

... SC.8.E.5.2 Recognize that the universe contains many billions of galaxies and that each galaxy contains many billions of stars. SC.8.E.5.3 Distinguish the hierarchical relationships between planets and other astronomical bodies relative to solar system, galaxy, and universe, including distance, size ...
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... gravitational forces of a planet or moon, which act upon an object. 10. Gravity is the natural force of attraction that exists between planets (like Earth) and all objects with mass. Gravity pulls objects toward the center of the Earth; it seems as if gravity “holds” things to the surface. The furth ...
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... Black Holes don’t suck, but if they hit you it sucks. A non-accreting black hole (“black hole on a diet”) is nearly impossible to detect. Since the beginning of time all massive star’s dead bodies litter the Galaxy. But still massive stars are not very common. Neutron stars and especially white dwar ...
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... d. Less massive protostars reach the main sequence in a shorter time than more massive protostars. ____ 49. Electron degeneracy occurs when a. solar wind particles become trapped in the Earth's magnetic field. b. thermonuclear reactions halt the contraction of a protostar. c. magnetic fields inhibit ...
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... generally phrased, the theory states that the Solar System condensed from a large, lumpy cloud of cold gas and dust. This idea was first in the late 18th century by two Europeans, Immanuel Kant and Pierre Laplace. Extensive observations since then have confirmed that the nebula theory is the best ex ...
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Rare Earth hypothesis



In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances. The hypothesis argues that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare. The term ""Rare Earth"" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.An alternative view point was argued by Carl Sagan and Frank Drake, among others. It holds that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common barred-spiral galaxy. Given the principle of mediocrity (also called the Copernican principle), it is probable that the universe teems with complex life. Ward and Brownlee argue to the contrary: that planets, planetary systems, and galactic regions that are as friendly to complex life as are the Earth, the Solar System, and our region of the Milky Way are very rare.
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