Democratic Sentinel, Volume 19, Number 42, Rensselaer, Jasper County, 25 October 1895 — When Mars Was Inhabited. [ARTICLE]

When Mars Was Inhabited.

There are many reasons in favor of the supposition that Mara is more likely to have been inhabited fat past ages than at the present time, in spite of its atmosphere er water or clouds. Mr. Proctor, for instance,, has pointed out that a globe of tbe size of Mars would cool rather more than two and a half times as quickly as one of the size of the earth. If the earth and Mars were ia a similar condition 18,000,000 years ago Mam would have attained (according to that rate of cooling) to the earth's present condition in 7,000.000 years, i. e., 11,000,000 years age; and the earth would now require future years in which to coal as much as Mars has cooled during the last 11,000,000 years. So for as regards that consideration, therefore, the probability of the present habitability of Mars must be compared with the probability of the earth’s being inhabited when 28,000,000 mere years will be past and gone.