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| Who's out there listening? (Public Domain) |
Perhaps
there are alien invaders out there who
would love a piece of our planet. But how would they know life exists
in this here corner of the universe?
Advanced
technology can detect chemicals
from amazing distances. Earth’s atmosphere
is loaded with life-indicating
molecules. Abundant oxygen shows
that something must be “pumping
out loads of O2.” In our case, that
something is photosynthetic plants. Earth’s atmospheric “levels of nitrogen,
carbon dioxide, nitrous oxide and methane”
are also live giveaways.
Light
emissions from our neon cities can also be
seen from light-years away with the
help of an ExoLife Finder (ELF) telescope, “at
least 130 feet wide [and] custom-built
for [this] task.” Humans expect to
build such a telescope within the coming
decade.
Aliens that
are closer than 590 trillion miles from
Earth might also pick up on our radio
transmissions. If they are any farther, then
“our earliest radio signals simply haven’t
reached them yet.”
Resources
https://www.msn.com/en-us/news/technology/aliens-could-detect-life-on-earth-heres-how/ar-BBKHsEn?li=BBnbfcL&ocid=BHEA000
Copyright March 26, 2018 by Linda Van Slyke All Rights Reserved
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