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Charlie Sensenbrenner's List: Requirements for life

Garik Israelian: How spectroscopy could reveal alien life | Video on TED.com

Garik Israelian is a spectroscopist, studying the spectrum emitted by a star to figure out what it's made of and how it might behave. It's a rare and accessible look at this discipline, which may be coming close to finding a planet friendly to life

www.ted.com/...lian_what_s_inside_a_star.html - Preview

on 2009-10-04 and saved by 2 people
- arik Israelian is a spectroscopist, studying the spectrum emitted by a star to figure out what it's made of and how it might behave. It's a rare and accessible look at this discipline, which may be coming close to finding a planet friendly to life.
WGNHS—Rock Elm meteorite

The Rock Elm meteorite
Sometime around 465 to 475 million years ago, a meteorite streaked across the sky, plowing through the shallow ocean and slamming into the earth at a speed of close to 70,000 miles per hour. It came to rest in what is now east-central Pierce County in western Wisconsin.

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on 2009-09-13
GoodPlanet Conso - a better way to consume

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on 2009-06-17
Science Centric | News | Meteorite bombardment may have made Earth more habitable

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on 2009-06-02
- bombardments of meteorites approximately four billion years ago could have helped to make the early Earth and Mars more habitable for life by modifying their atmospheres
- extreme heat causes some of the minerals and organic matter on its outer crust to be released as water and carbon dioxide before it breaks up and hits the ground
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- - could have made Earth's and Mars' atmospheres wetter
  - each meteorite was capable of releasing up to 12 percent of the meteorites' mass as water vapour and 6 percent of the meteorites' mass as carbon dioxide when entering an atmosphere
  - an ancient meteorite shower called the Late Heavy Bombardment (LHB), which occurred 4 billion years ago, where millions of rocks crashed to Earth and Mars over a period of 20 million years
  - 10 billion tonnes of carbon dioxide and 10 billion tonnes of water vapour could have been delivered to the atmospheres of Earth and Mars each year.
  - Mars' good fortune did not last. Unlike Earth, Mars doesn't have a magnetic field to act as a protective shield from the Sun's solar wind. As a consequence, Mars was stripped of most of its atmosphere.
  - A reduction in volcanic activity also cooled the planet. This caused its liquid oceans to retreat to the poles where they became ice.
Astrobiology

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astriobiology requirements on 2009-04-05
Science Centric | News | Kepler rockets to space in search of Earth analogues

Kepler telescope begins its search for other earth-like planets that could possibly hold life.

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on 2009-03-08
- At 3:49 GMT today, 7 March, NASA's Kepler mission successfully launched into space from Cape Canaveral Air Force Station, Florida, aboard a United Launch Alliance Delta II. Kepler is designed to find the first Earth analogues orbiting stars at distances where water could pool on the planet's surface. Liquid water is believed to be essential for the formation of life. By the end of Kepler's three-and-one-half-year mission, it will give us a good idea of how common or rare other Earths are in our Milky Way galaxy.
- so meaningful to the human race - Kepler will help us understand if our Earth is unique or if others like it are out there.
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- - Kepler now has the perfect place to watch more than 100,000 stars for signs of planets,'
  - We are on the verge of learning if other Earths are ubiquitous in the galaxy.'
  - is the world's first mission with the ability to find true Earth analogues - planets that orbit stars like our sun in the 'habitable zone.'
  - Kepler's three-and-one-half-year mission, it will give us a good idea of how common or rare other Earths are in our Milky Way galaxy
  - Kepler detects planets by looking for periodic dips in the brightness of stars. Some planets pass in front of their stars as seen from our point of view on Earth; when they do, they cause their stars to dim slightly, an event Kepler can see.
New Mars Pictures Show Signs of Watery "Aquifers"

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aquifers Mars on 2009-02-27
DISCOVERY ::: MISSIONS ::: KEPLER

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habitable zone rocky planets life NASA on 2009-02-27
BBC NEWS | Science/Nature | Planet-hunters set for big bounty

Rocky planets, possibly with conditions suitable for life, may be more common than previously thought in our galaxy, a study has found.

news.bbc.co.uk/...7249884.stm - Preview

planethunters planets on 2009-02-27 and saved by 4 people
- ocky planets, possibly with conditions suitable for life, may be more common than previously thought in our galaxy, a study has found.
- New evidence suggests more than half the Sun-like stars in the Milky Way could have similar planetary systems.
Astrobiology: The Living Universe - Characteristics of Life

Discusses the traits of living things...

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traits of life on 2009-02-26
- What is life? What does it mean do be alive? How is something made “living”? These are all pertinent questions when discussing the origin of life. Scientists have identified seven basic characteristics of life. For something to be described as living, that something must display all seven of these characteristics. Although many different people have many different opinions about what "living" means, the following characteristics were designated "characteristics of living things" with the consensus of the scientific community.
Jill Tarter's call to join the SETI search | Video on TED.com

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on 2009-02-21 and saved by 3 people
BBC NEWS | Science & Environment | Number of alien worlds quantified

planets life extraterrestrial

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on 2009-02-06 and saved by 6 people
CO2 on distant planet boosts search for alien life - Telegraph

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life planets exploration on 2009-02-06
Alien plants 'more colourful than Earth's flora' - Telegraph

Our land may be green and pleasant but a Nasa team predicts today that foliage on an alien world could be a spectrum of different colours, from yellow to orange or even crimson.

www.telegraph.co.uk/...lourful-than-Earths-flora.html - Preview

plants photosynthesis yellow_star sun requirements_for_life on 2009-02-06

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Charlie Sensenbrenner

14 items | 13 visits

How does Earth support life? What does a planet need to hold life? Is Earth the only habitable planet?

Updated on 2009-10-04
Created on 2009-01-18

Category: Science

astronomical_conditions gravity oxygen water moderate_temperature protection_from_gasses_and_radiation

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Charlie Sensenbrenner's List: Requirements for life

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