Astrobiology (general): December 2013

The House Committee on Science, Space and Technology held a December 4 hearing to assess the multi- and interdisciplinary nature of astrobiology research.

"We stand on a great threshold in the human history of space exploration."

"For thousands of years, humans have looked up at the stars and wondered whether life exists beyond our home planet."

"Chairman Smith, Ranking Member Johnson, and members of the Committee, thank you for the opportunity to testify today on the subject of the past and future of astrobiology."

In the redshift range 100<(1+z)<110, the cosmic microwave background (CMB) had a temperature of 273-300K (0-30 degrees Celsius), allowing early rocky planets (if any existed) to have liquid water chemistry on their surface and be habitable, irrespective of their distance from a star.