Habitable Zones & Global Climate
The habitable zone (HZ) around a star is typically defined as the region where a rocky planet can maintain liquid water on its surface.
Cosmic rays may be linked to the formation of volatiles necessary for prebiotic chemistry.
We present the results of simulations on the detectability of O2 in the atmosphere of Earth twins around nearby low mass stars using high resolution transmission spectroscopy.
We present narrow-band photometric measurements of the exoplanet GJ 1214b using the 10.4 m Gran Telescopio Canarias (GTC) and the OSIRIS instrument.
We study the masses and radii of 60 exoplanets smaller than 4 Earth radii with orbital periods shorter than 100 days.
Context: The dusty debris disk around the ~20 Myr old main-sequence A-star beta Pic is known to contain gas.
"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.
Using the powerful eye of NASA's Hubble Space Telescope, two teams of scientists have found faint signatures of water in the atmospheres of five distant planets.
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