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- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_2e_(OpenStax)/30%3A_Life_in_the_Universe/30.04%3A_Searching_for_Life_beyond_EarthThe search for life beyond Earth offers several intriguing targets. Mars appears to have been more similar to Earth during its early history than it is now, with evidence for liquid water on its ancie...The search for life beyond Earth offers several intriguing targets. Mars appears to have been more similar to Earth during its early history than it is now, with evidence for liquid water on its ancient surface and perhaps even now below ground. This offers the exciting potential to directly examine ancient and modern samples for evidence of life. Recent research on exoplanets leads us to believe that there may be billions of habitable planets in the Milky Way Galaxy.
- https://phys.libretexts.org/Courses/Grossmont_College/ASTR_110%3A_Astronomy_(Fitzgerald)/15%3A_Life_in_the_Universe/15.03%3A_Searching_for_Life_beyond_EarthThe search for life beyond Earth offers several intriguing targets. Mars appears to have been more similar to Earth during its early history than it is now, with evidence for liquid water on its ancie...The search for life beyond Earth offers several intriguing targets. Mars appears to have been more similar to Earth during its early history than it is now, with evidence for liquid water on its ancient surface and perhaps even now below ground. This offers the exciting potential to directly examine ancient and modern samples for evidence of life. Recent research on exoplanets leads us to believe that there may be billions of habitable planets in the Milky Way Galaxy.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/30%3A_Life_in_the_Universe/30.03%3A_Searching_for_Life_beyond_EarthThe search for life beyond Earth offers several intriguing targets. Mars appears to have been more similar to Earth during its early history than it is now, with evidence for liquid water on its ancie...The search for life beyond Earth offers several intriguing targets. Mars appears to have been more similar to Earth during its early history than it is now, with evidence for liquid water on its ancient surface and perhaps even now below ground. This offers the exciting potential to directly examine ancient and modern samples for evidence of life. Recent research on exoplanets leads us to believe that there may be billions of habitable planets in the Milky Way Galaxy.
