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Habitable zone - Penn State University
Habitable zone - Penn State University

TCI_Paper2_ConditionsForLife
TCI_Paper2_ConditionsForLife

... University of New South Wales in Australia, there is a sort of “Goldilocks zone of metallicity” for the formation of planets similar to Earth (Lineweaver 60). On the one hand, too little metallicity results in Earth-mass planets being unable to form, since a minimum abundance of heavy elements are n ...
Life: Definition, Origin, Criteria
Life: Definition, Origin, Criteria

Life: Definition, Origin, Criteria
Life: Definition, Origin, Criteria

AST101_lect_18
AST101_lect_18

Johnnie French Lab 1
Johnnie French Lab 1

... separates the inner solar system from the outer. The belt is actually very spread out and is comprised of less material than is found in our moon. Dwarf planets include Ceres, an asteroid, Pluto and Eris, Kuiper belt objects. Pluto’s orbit is tilted 15 degrees out of plane and is highly elliptical. ...
notes
notes

... star's habitable zone, where it is possible for liquid water, a prerequisite for life on Earth, to exist on the surface. The study of planetary habitability also considers a wide range of other factors in determining the suitability of a planet for hosting life ...
Part I: Moons, Asteroids, and Comets
Part I: Moons, Asteroids, and Comets

... Scroll down to the section labeled. 1.  What elements compose a star? _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ 2.  List ...
Quiz # 5
Quiz # 5

No Slide Title
No Slide Title

Astrobiology News for July 2013: What Makes a Planet Habitable
Astrobiology News for July 2013: What Makes a Planet Habitable

New Scientist Magazine - Surrey, England… 19th November 2008
New Scientist Magazine - Surrey, England… 19th November 2008

Uninhabitableearth
Uninhabitableearth

... Write on the board before students enter the room: “What conditions are necessary to sustain life on earth?” Brainstorm to review the following term: “Habitable Zone.” As a class watch the Newsy.com video Study: Earth Will Be Uninhabitable in 1.75 Billion Years at http://www.newsy.com/videos/study-e ...
A Census of the Solar System
A Census of the Solar System

Quick Quiz solutions for Chapters 8,9,10
Quick Quiz solutions for Chapters 8,9,10

ppt-file 2.4 MB
ppt-file 2.4 MB

Life on Other Planets
Life on Other Planets

Astronomy HOMEWORK Chapter 5 - 9th Edition 2. Pluto is most
Astronomy HOMEWORK Chapter 5 - 9th Edition 2. Pluto is most

Day-7
Day-7

Kuiper Belt - Shades of Blue
Kuiper Belt - Shades of Blue

... Exoplanet 55 Cancri e twice Earth’s Size – and made largely of diamond Oct 12, 2012 – Wired UK ...
Centre of Mass
Centre of Mass

... • For life to exist on a palnet, it must also be in the habitable zone. This is the region in the solar system which is neither too hot nor too cold, but just right. Astronomers believe that in other solar systems, too, such habitable zones exist and life is more probable in those planets which fall ...
Another Earth - WordPress.com
Another Earth - WordPress.com

Monday Sept 14
Monday Sept 14

Is there anybody out there?
Is there anybody out there?

... N* = stars in the Milky Way galaxy --> 200 to 300 million fp = fraction of stars with planets --> 5-6% fpm = fraction of metal-rich planets --> less than 1% ne = planets in a stars habitable zone --> 1 ng = stars in a galactic habitable zone fi = fraction of habitable planets where life does arise ...
Extra-Solar Planets
Extra-Solar Planets

< 1 ... 48 49 50 51 52 >

Circumstellar habitable zone



In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the region around a star within which planetary-mass objects with sufficient atmospheric pressure can support liquid water at their surfaces. The bounds of the CHZ are calculated using the known requirements of Earth's biosphere, its position in the Solar System and the amount of radiant energy it receives from the Sun. Due to the importance of liquid water to life as it exists on Earth, the nature of the CHZ and the objects within is believed to be instrumental in determining the scope and distribution of Earth-like extraterrestrial life and intelligence.The habitable zone is also called the Goldilocks zone, a metaphor of the children's fairy tale of Goldilocks and the Three Bears, in which a little girl chooses from sets of three items, ignoring the ones that are too extreme (large or small, hot or cold, etc.), and settling on the one in the middle, which is ""just right"".Since the concept was first presented in 1953, stars have been confirmed to possess a CHZ planet, including some systems that consist of multiple CHZ planets. Most such planets, being super-Earths or gas giants, are more massive than Earth, because such planets are easier to detect. On November 4, 2013, astronomers reported, based on Kepler data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarfs in the Milky Way. 11 billion of these may be orbiting Sun-like stars. The nearest such planet may be 12 light-years away, according to the scientists. The CHZ is also of particular interest to the emerging field of habitability of natural satellites, because planetary-mass moons in the CHZ might outnumber planets.In subsequent decades, the CHZ concept began to be challenged as a primary criterion for life. Since the discovery of evidence for extraterrestrial liquid water, substantial quantities of it are now believed to occur outside the circumstellar habitable zone. Sustained by other energy sources, such as tidal heating or radioactive decay or pressurized by other non-atmospheric means, the basic conditions for water-dependent life may be found even in interstellar space, on rogue planets, or their moons. In addition, other circumstellar zones, where non-water solvents favorable to hypothetical life based on alternative biochemistries could exist in liquid form at the surface, have been proposed.
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