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revolve (revolution) rotate (rotation) axis
revolve (revolution) rotate (rotation) axis

... the partial or total blocking of sunlight on the moon by the Earth; this occurs when the full moon passes through Earth’s shadow ...
Scientific Investigation - Kempsville Middle School
Scientific Investigation - Kempsville Middle School

... 75. Non-renewable resources may not be used more than one time such as coal, oil, and natural gas. 76. Conductors are materials that allow electricity to flow through them, such as metal. 77. Insulators are materials that block electricity, such as rubber. 78. Voltage describes the "push" of electro ...
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Slide 1

SOL Review Packet Questions
SOL Review Packet Questions

... Dust and gasses are ejected into the atmosphere by Water vapor and carbon dioxide affect the ability of Earth’s atmosphere to absorb and retain Day-to-day changes in the conditions of the atmosphere is called Typical weather patterns for a location over a long period of time describes ...
The atmospheres of different planets
The atmospheres of different planets

Document
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Intro Lecture: Stars - University of Redlands
Intro Lecture: Stars - University of Redlands

... the Big Dipper. It was the first binary star system to be imaged with a telescope. Spectroscopic observations show periodic Doppler shifts in the spectra of Mizar A and B, indicating that they are each binary stars. But they were too close to be directly imaged - until 2 May 1996, when the NPOI prod ...
the Up2d8 Maths resource
the Up2d8 Maths resource

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Objects in the Sky
Objects in the Sky

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The Night Sky

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Space+-+the+final+frontier

Ancient Astronomy - Mrs. Petersen`s Earth Science
Ancient Astronomy - Mrs. Petersen`s Earth Science

... one of the basic measures of distance for astronomy. When designing probes for trips to other planets in our solar system it is important for the planners to keep the communications time lag, caused by the speed of light, in mind. For example, a probe designed to land on Mars must be smart enough to ...
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Earth in Space ReadingEarth in Space Reading(es)

... sun  appears  to  move  westward  across  the  sky.  It  is  day  on  the  side  of  Earth  facing   the  sun.  As  Earth  continues  to  turn  to  the  east,  the  sun  appears  to  set  in  the  west.   Sunlight  can’t  reac ...
Let us calculate planet`s orbit radii and its average orbital
Let us calculate planet`s orbit radii and its average orbital

... ecliptic. Two large pieces were entrapped by Saturn and Neptune is Japetus and Triton accordingly. As the declination of the Mars orbit relatively to plane of ecliptic is 1.85 and Neptune one is 1.77, the probability of Triton capture by Neptune is rather high. At possible impact of a Triton on Ne ...
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... • If we consider (on average) a 1% chance of each of the previously mentioned factors occurring favorable to life, that is…. • One chance in 1040 • Compared to “only” 1022 stars in the Universe • Therefore… we have a pretty unique home  ...
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What is a planet?

... •  extrasolar planets are simply very low-mass stars that form from collapse of multiple condensations in protostellar clouds •  good points: –  distribution of eccentricities and periods of extrasolar planets very similar to distributions for binary stars •  bad points: –  why is there a brown-dwar ...
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Venus

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Passport to the Universe Educator`s Guide Text

... the Earth and the other planets in the larger scheme of things. From out here, the sizes of and distances between the Earth, Sun, and other planets appear relatively small. On our trip, we pass three of the eight planets—Mars, Jupiter (and its moons, Io and Europa), and Saturn. We now head out for ...
Study Guide for the Final Astronomy Exam
Study Guide for the Final Astronomy Exam

... C) Identify the OB Association in an HII region photograph D) Use the Initial Mass (Birth) Function to explain why the most common stars are not like the Sun. 10) Unit 61: Main Sequence Stars A) Be able to write down the mass, luminosity, radius, temperature, and lifetime in solar units of main sequ ...
Earth in Space Reading
Earth in Space Reading

... sun  appears  to  move  westward  across  the  sky.  It  is  day  on  the  side  of  Earth  facing   the  sun.  As  Earth  continues  to  turn  to  the  east,  the  sun  appears  to  set  in  the  west.   Sunlight  can’t  reac ...
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What is your real star sign - teacher notes

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Chapter 39

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The Earth - for physicists - University of California, Riverside
The Earth - for physicists - University of California, Riverside

... why the snowball-Earth events started when they did, and why the Earth did not stay frozen. Here is a currently popular answer to the last question. Ice sheets slow down the weathering of rock. This weathering is one of the main long-term processes that use up atmospheric carbon dioxide, by converti ...
Practice questions for Stars File
Practice questions for Stars File

... 2. Describe the fuel use changes from birth to death for a black hole 3. Describe the fuel use changes from birth to death for a neutron star 4. Explain how the energy changes are involved in each of their life cycles from birth to death. 5. Explain how the gravity changes are related to the final s ...
Blue Marble in Empty Space
Blue Marble in Empty Space

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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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