The European Space Agency's Venus Express mission saw something it could not explain. It appeared that there were holes on the nightside of Venus' ionosphere. Researchers at NASA's Goddard Space Flight Center investigated these mysterious holes, and found evidence that the sun's magnetic field lines may be penetrating through the planet.
Credit: NASA/Goddard Space Flight Center
http://www.nasa.gov/content/goddard/nasa-research-helps-unravel-mysteries-of-the-venusian-atmosphere/
