From arachnid-like formations and mysterious blobs to an underground ocean and a giant volcano, here are our 10 favorite ...

From the iconic "spiders on Mars" and a giant dog-shaped blob to an underground ocean and other newly discovered water deposits, here are our 10 favorite things found on Mars this year.

In September, dozens of mysteriously dense blobs — including a structure with a surprisingly canine shape — were found lurking beneath ... revealed underground ocean and the abundant frost ...