Subscribe free to our newsletters via your
. 24/7 Space News .

Search for alien life more complicated than thought, scientists say
by Staff Writers
Denver (UPI) Oct 8, 2013

Finding life on distant exoplanets may be more difficult than scientists thought, researchers from China, the United States and Argentina said Monday.

Recent observations of several planet-hosting M dwarf stars -- the focus of current efforts to find Earth-like planets -- showed ultraviolet properties of the small stars are quite different from those of the sun, which could further complicate the search for alien life, the researchers told a meeting of the American Astronomical Society Division for Planetary Sciences in Denver.

That could complicate the search for chemical signs of life, they said.

Feng Tian, a professor at Tsinghua University, and his U.S. and Argentine colleagues have shown that the atmosphere of a hypothetical habitable planet around such a star could build up significant levels of oxygen -- one possible "signature" of alien life -- even in the absence of any such life.

"Before we can claim the discovery of life on exoplanets, we have to examine the stars harboring these planets more carefully," the researchers said.

Other scientist agreed.

"The authors of this paper make an important point regarding the confidence we could have in the detection of O2 simultaneously with H2O and CO2, as a biosignature in the spectrum of an Earth- like exoplanet around an M star," Alain Leger of the Institute d'Astrophysique Spatiale at University of Paris said.


Related Links
Life Beyond Earth
Lands Beyond Beyond - extra solar planets - news and science

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

Rensselaer Researchers Propose New Theory To Explain Seeds of Life in Asteroids
Troy NY (SPX) Oct 04, 2013
A new look at the early solar system introduces an alternative to a long-taught, but largely discredited, theory that seeks to explain how biomolecules were once able to form inside of asteroids. In place of the outdated theory, researchers at Rensselaer Polytechnic Institute propose a new theory - based on a richer, more accurate image of magnetic fields and solar winds in the early solar ... read more

NASA's moon landing remembered as a promise of a 'future which never happened'

Russia could build manned lunar base

China unveils its first and unnamed moon rover

Mission to moon will boost research and awareness

ESA's test rover begins exploring Atacama Desert

Mars Hand Lens Imager Sends Ultra High-Res Photo From Mars

Making Martian clouds on Earth

NASA Mars mission escapes government shutdown, will launch

NASA ban on Chinese scientists 'inaccurate': lawmaker

Naval Institute History Conference: From Mercury to the Shuttle

Samsung to break ground at US research center

Non-Orbiting Space Junk

China criticises US space agency over 'discrimination'

NASA ban on Chinese scientists 'inaccurate': lawmaker

What's Next, Tiangong?

Onward and upward as China marks 10 years of manned spaceflight

Aerojet Rocketdyne Thrusters Help Cygnus Spacecraft Berth at the International Space Station

First CASIS Funded Payloads Berthed to the ISS

Unmanned cargo ship docks with orbiting Space Station

New space crew joins ISS on Olympic torch mission

Sunshield preparations bring Gaia closer to deep-space Soyuz launch

SES-8 Arrives At Cape Canaveral For SpaceX Falcon 9 Launch

Spaceport Colorado and S3 Sign Memorandum of Understanding

Milky Way-mapping Gaia receives its sunshield

Lonely planet without a star discovered wandering our galaxy

Researchers Find that Bright Nearby Double Star Fomalhaut Is Actually a Triple

NASA Space Telescopes Find Patchy Clouds On Exotic World

Blurring the lines between stars and planets

Ultrasound system gives virtual feeling of objects in mid-air

Himawari and Mitsubishi Electric Complete Facilities For Weather Satellite Ops

Disney Research develops algorithm for rendering 3-D tactile features on touch surfaces

World's Largest Solar Sail, Sunjammer, Completes Test

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement