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Exploratour - Life in the Solar System

This is an image of Comet Kohoutek.
Click on image for full size
NASA

Read about the theory of Comet origin of life

Exporatour: Life on Earth

Believe it or not, many scientists believe that life may have begun on these distant, solar system traveling objects. Out in their distant home, the Oort Cloud, comets are exposed to the kind of cosmic radiation which provides the energy needed to form long, complex molecules such as amino acids, proteins, and even polycyclic aromatic hydrocarbons (PAH's). Spectra taken of recent comets such as this one in 1990 reveal the presence of ...

As we've said, because of the severe temperatures, it may take millions of years for these molecules to form, thus precluding the possiblity of the activity of life forms as sophisticated as bacteria. Moreover, there is no atmosphere to speak of in comets in residence in the Oort cloud, and only a transient atmosphere in comets making a perihelion passage. Nevertheless, over the age of the solar system, and because comets making a perihelion passage loose a portion of their friable surface, it is thought that comets may have brought some of life's beginnings to the inner solar system where they could better thrive.

Read more about this possibility by reading our life section. Read more about the sort of unsophisticated life forms found on the primordial Earth by taking the Exporatour of Life on Earth.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information.

The source of this material is Windows to the Universe, at http://windows2universe.org/ from the National Earth Science Teachers Association (NESTA). The Website was developed in part with the support of UCAR and NCAR, where it resided from 2000 - 2010. © 2012 National Earth Science Teachers Association. Windows to the Universe® is a registered trademark of NESTA. All Rights Reserved. See our copyright and licenses page for information about how you can use our materials.Site policies and disclaimer.

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