Liquid water found on Mars
Q. Mars has recently been found to contain which element on the surface, suggesting the possibility of life?- Published on 29 Sep 15a. Carbon
b. Water
c. Nitrogen
d. Oxygen
ANSWER: Water
Definite signs of liquid water have been found by the high-resolution camera on Nasa's Mars Reconnaissance Orbiter on the surface of the red planet. Scientists discovered waterlogged molecules — salts of a type called as perchlorates — in orbit readings. That's a direct detection of water in the form of hydration of salts. In 2011, scientists discovered in photographs from the Mars Reconnaissance Orbiter dark streaks descending along slopes of craters, canyons and mountains. The streaks lengthened during summer, faded as temperatures cooled, then reappeared the later. Streaks were named recurrent slope linae, or RSLs, and scientists hold that water played a critical role in the phenomenon, akin to the way concrete darkens when wet, with no change in the shape of the surface, and returns to its original colour when drying.
