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The Earth in Perspective
The Earth in Perspective

Organize Your Space PowerPoint.
Organize Your Space PowerPoint.

... mass of the earth and if all the asteroids were combined together their diameter would be only half the diameter of our moon. ...
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...  Has the greatest temperature extreme of any planet  Night -173˚C  Day 427˚C ...
04 Aug 2007
04 Aug 2007

... monitor 60,000 stars and discover hundreds of planets including tens of Earth-like planets. NASA's Kepler mission in 2008 will monitor 100,000 sun-like stars and probably find dozens of Earth-like planets in the habitable zone. Europe's Darwin mission in 2014 will comprise several space vehicles "fl ...
A Census of the Solar System
A Census of the Solar System

... Uses the transit method and survey thousands of stars repeatedly at least 3 – 4 times to determine period and orbit of transiting planet. ...
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Topic 9/10

... Asteroid- rocky objects up to 600 miles across, there is a belt b/t Mars and Jupiter Meteor- falling star Comet- icy objects caught in highly elliptical orbits Star- large self-luminous body in space that creates its own energy Nuclear fusion- where the sun gets its energy, 2 hydrogens fuse (combine ...
Small Planets of our Solar System (Pluto is a Dwarf Planet)
Small Planets of our Solar System (Pluto is a Dwarf Planet)

Astronomy Unit Notes - sciencepowerpoint.com
Astronomy Unit Notes - sciencepowerpoint.com

... Craters can be found on earth, but most craters are eroded away by wind and water. Most meteorites also burn up in our atmosphere. Phases of the Moon ...
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Astronomy Unit Vocabulary Term Definition Example Light years are

... A unit of measurement used in astronomy. Equal to the distance from the earth to the sun. Theory that states that the formation and expansion of the universe resulted from an initial ...
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... describe and predict some observable phenomenon. Extensive tests are carried out to measure the validity of any hypothesis. When the evidence in favor of the hypothesis is overwhelming, it becomes a scientific theory. p. 8 RQ #3 What is the difference between our solar system, our galaxy and the uni ...
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solar system study guide

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Solar System

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... sunlight and eternal darkness. Another problem with the habitable zones around these long-lived stars is that they are extremely narrow; a planet in a random orbit is unlikely to find itself at a distance that is “just right.” Conversely, large, hot, luminous stars have enormous habitable zones in w ...
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Earth Science 2nd 9 wk review

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Chapter 1: A Universe of Life

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... • How close have we ever come to the total extinction of all life on earth? • A very large impact could kill all life. – It would have to be so large that the heat boiled away all the oceans and filled the atmosphere with molten rock! – Perhaps this happened very early on and life had to start more ...
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... The Universe – Everything there is; all energy, space, and matter Astronomy – The study of the universe beyond the earth’s atmosphere. Solar System – the Sun and all the objects that travel around it due to gravitational force. Objects = planets, over 60 satellites (moons) orbiting the planets, thou ...
Kuiper Belt - Shades of Blue
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Solar System

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A B C`s of Space Aleks Slocum Second Grade SCI.2.2 2010
A B C`s of Space Aleks Slocum Second Grade SCI.2.2 2010

< 1 ... 357 358 359 360 361 362 363 364 365 ... 373 >

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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