The first alien ID chart

How would Earth look (observed by an alien astronomer) seen through geological time, from its birth to today? And how good do our instruments need to be to not miss signatures of life through Earth's evolution until now?  We generate the “spectral fingerprints” of Earth through geological times using fossil records as proxy for evolutionary stages of an exoEarths. An alien ID chart...

Paper: Kaltenegger, L et al., Spectral Evolution of an Earth-like Planet, ApJ 658, 598, 2007 http://arxiv.org/abs/astro-ph/0609398 Institute for Pale Blue Dots

Klarman Hall at sunset

Tweets from CSInst

is an annual twitter competition hosted by to determine the most popular exoplanet of the year.… https://t.co/IgYMfPedoH
1 day 15 hours ago
We endorse , the 1st close-in planet found around a white dwarf, for ! To learn more about the… https://t.co/tX63gdObmU
1 day 16 hours ago
RT : So proud to hear the 100th episode of ! Thank you for bringing our to the local… https://t.co/naRcsnpdSB
2 days 12 hours ago
RT : Learn skills ! is offered online & open to everyone! Build a comm strategy,create… https://t.co/2vOy0egObM
2 days 14 hours ago
RT : Is there beyond ? "I think the numbers are forever in our favor," says of &… https://t.co/5VOEFUwRav
3 days 20 hours ago
Happy Thanksgiving to our American colleagues & followers. This year’s parade in NYC included a https://t.co/AMzaF6lKIo
3 days 21 hours ago