And the Search for Habitable Worlds - National Academies · 2020. 4. 8. · Gliese 581 Planetary...
Transcript of And the Search for Habitable Worlds - National Academies · 2020. 4. 8. · Gliese 581 Planetary...
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Exoplanets And the Search
for Habitable
Worlds
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Are we Alone?
Hundreds of billions of stars …
… hundreds of billions of galaxies
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Earth: The Pale Blue Dot
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The “Goldilocks Zone” or
“Habitable Zone”
1
Sun
K2
M6
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?
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John E. Kauffman
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Known Planets 2010
Based on data compiled by J. Schneider
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Zone where transit can
be seen from
Lynnette Cook
Goal: to find transiting Earth-size planets in the habitable zones
Kepler: How Common are Earths?
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National Geographic
used with permission
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Direct imaging: 10-10
Transiting Earth: 10-4
Transiting super Earth
around a small star: 10-3
National Geographic
used with permission
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Cash 2006
Terrestrial Planet Finder
Goal: to find planets in the star’s
habitable zone and look for
biosignatures.
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Cash 2006
Terrestrial Planet Finder
Northrup Grumman external occultor test bed
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Biosignature Gases
Turnbull et al. 2007
Pearl and Christensen 1997
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No alien civilization appears to be continuously
broadcasting a powerful “beacon” signal from a planet
circling any of the nearest 1,000 or so Sunlike stars, at
least in the frequency bands searched to date.
SETI
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SETI
• No alien civilization
appears to be
continuously
broadcasting a powerful
“beacon” signal from a
planet circling any of
the nearest 1,000 or so
Sunlike stars, at least in
the frequency bands
we’ve searched.”