A few hundred thousand billion free-floating, Earth-sized planets may exist in the space between stars in the Milky Way, argues an international team of scientists in Astrophysics and Space Science.
Because it's required for astronomy claims this decade, they make note that those planets could have alien life.
The scientists have proposed that these life-bearing planets originated in the early Universe within a few million years of the Big Bang, and that they make up most of the so-called 'missing mass' of galaxies. They calculate that such a planetary body would cross the inner solar system every 25 million years on the average and during each transit, zodiacal dust, including a component of the solar system’s living cells, becomes implanted at its surface. The free-floating planets would then have the added property of mixing the products of local biological evolution on a galaxy-wide scale.
Credit: Professor Chandra Wickramasinghe, Director of the Buckingham Centre for Astrobiology at the University of Buckingham
Since 1995, when the first extrasolar planet was reported, interest in searching for planets has reached a feverish pitch. The 750 or so detections of exoplanets are all of planets orbiting stars and there have been no realistic potential candidates for alien life. The possibility of a much larger number of planets was first suggested in earlier studies where the effects of gravitational lensing of distant quasars by intervening planet-sized bodies were measured.
Recently several groups of investigators have suggested that a few billion such objects could exist in the galaxy. The new research has increased this grand total of planets to a few hundred thousand billion (a few thousand for every Milky Way star) - each one harboring the legacy of ancient cosmic primordial life.
Citation: Wickramasinghe NC et al (2012), 'Life-bearing primordial planets in the solar vicinity', Astrophysics and Space Science, DOI 10.1007/s10509-012-1092-8
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- As Dawn Approaches, The First Color Images Of Ceres
- NailO: Your Thumb As A Miniature Wireless Track Pad
- Eyes Are On The James Webb Space Telescope As Hubble's 25th Anniversary Approaches
- Can Moons Have Moonlets? Or Rings?
- Thorium Can Serve As A Nuclear Fuel For Commercial Electricity Generation
- Should Caffeine Be A Schedule 1 Drug?
- Dr. Henry Miller To Columbia: Give Oz The Boot
- "I was wrong in thinking that environmentalism would lose because (a) it is too silly and (b) the..."
- "I have a serious problem with your logic: Hospital death rates are indeed a serious problem, but..."
- "Hawaii is infested with professional Hawaiians who have learned how to make a good living over..."
- "Michael, I have three issues with your comment. First, the medical community is very aware of the..."
- "I had open heart surgery by Dr. Oz, his partner and a robot a couple of years ago. The type of..."