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'Martian dog' and dozens of other mysterious blobs found hiding under Mars' north pole in new 'gravity map'

Live Science
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78% Informative

A new "gravity map" of Mars reveals mysterious blobs beneath an ancient seabed.

The map also confirms the presence of a massive 1,100-mile -wide blob under Olympus Mons , a dormant volcano near Mars ' equator.

The dense structures could be volcanic in origin or could be compacted material due to meteor impacts.