The bombardment of the Red Planet about 4 billion years ago (Noachian period) by giant comets and asteroids likely enhanced climate conditions enough to make the planet more conducive to life, at least for a time, according to a new study that will be published in the May 15 issue of the journal Earth and Planetary Science Letters. This image of an impact crater in the Sirenum Fossae region of Mars was taken by NASA’s Mars Reconnaissance Orbiter...
