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The Spring 2011 issue of The Earth Scientist is focused on modernizing seismology education. Thanks to IRIS, you can download this issue for free as a pdf. Print copies are available in our online store.
This picture shows NASA's Deep Space Network, which searches the sky for radio signals.
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NASA/JPL

Looking for Life's garbage

Most forms of life leave evidence behind that they are there. Plants use up carbon dioxide and release oxygen. Some bacteria are known to release nitrogen into the environment. People leave behind smog, radio signals, and garbage.

Io, Titan, and perhaps Triton, show some of the waste products of life, including molecules of oxygen, nitrogen, or the more sophisticated hydrocarbons such as Polycyclic-Aromatic-Hydrocarbons (PAH's). These constituents are not present in the environments of most planets and moons.

This means that there is no evidence that sophisticated creatures are present.


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"Science, Evolution, and Creationism", by the National Academies, provides fascinating background on these topics for all, and is particularly useful for the Earth and space science classroom. Check our other books in our online store.

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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. NASA ESIP NCSE HHMI AGU AGI AMS NOAA