Casual Friday — Methane on Mars!

Using the Hubble space telescope, astronomers have discovered that a number of sites on Mars have periodically emitted huge amounts of methane. Is the source biology, or just geology? Only time will tell…

First, a quick overview from NASA (2m 25sec):

Next, the first part of the official announcement (7m 01sec):

Finally, the second part of the announcement (7m 46sec):

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