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Characteristics of Stars
Characteristics of Stars

... (a dim star can appear bright if its close to Earth; a bright star can appear dim if its far away) ...
Standard 1 Information Sheet
Standard 1 Information Sheet

... STANDARD 1. Astronomy and planetary exploration reveal the solar system’s structure, scale, and change over time. As a basis for understanding this concept: Section A Students know how the differences and similarities among the Sun, the terrestrial planets, and the gas planets may have been establis ...
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Other Planetary Systems

... This Explains Why… …in many of the planetary systems detected so far, we find big, massive planets quite close to the parent stars (especially with the ‘wobble’ technique; using transits is better able to find smaller planets.) It will take many years, and improving technology, to allow the confirm ...
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Galaxies and the Universe - Mr. Jones's Science Class

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Earth and the Moon in Space

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... this planet has a moon named Triton that revolves around it in the opposite direction to the planet’s rotation this gas giant is the least dense of all the planets and currently has over 50 moons this planet’s atmosphere is composed primarily of carbon dioxide gas this planet is dry and barren with ...
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... because they were based on wrong “first principles”, believed to be “obvious” and not questioned: 1. Geocentric Universe: Earth at the Center of the Universe. 2. “Perfect Heavens”: Motions of all celestial bodies described by motions involving objects of “perfect” shape, i.e., spheres or circles. ...
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Astronomy Objective 1 1. An asteroid is a small, rocky object that

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Loz and Megs Solar System Presentation

... from the Sun and is the largest of the terrestrial planets. Earth is also referred to as "the Earth", "Planet Earth", "Gaia", "Terra", or "the World". This is the first planet known to have liquid water on the surface and the only place in the universe known to have life on it. Earth has a magnetic ...
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Astronomy 101 Section 4

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Astronomy Exam Reveiw ANSWER KEY

... 31. When a massive star can no longer produce enough energy to keep it in balance, it collapses and explodes. Sometimes, binary stars can send energy from one to the other and also cause an explosion. These powerful blasts are called: a. comets b. supernovas c. black holes 32. When a star several t ...
Subject- Geography Class- VI Chapter 1
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... The sun, the moon and all those objects shining in the night sky are called celestial bodies. Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars. Some celestial bodies do ...
Formation of Planets III
Formation of Planets III

... begins, the star emits a large wind, called a ________________, named after the star where it was first observed. This wind would push out all the gas from the solar system and also cause the spin of the sun to slow down. We can now look at a list of the elements in the original nebular cloud and se ...
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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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