The mission would have also returned images of Mars' surface.
The two missions returned the first color pictures and extensive scientific information.
The mission returned to Japan in failure, on July 22, 1864.
The mission is returning approximately 70-100 Terabytes of image data.
Her work was done, and so very likely the mission would soon return to Mars.
The mission returned home September 13, 1873, almost two years after setting out.
Despite these disappointments, scientists said the mission did return new and important data.
Neither woman was willing to complete the thought that the away mission might not return at all.
I am aware that the mission has returned with accounts of terrible violence and great fear.
Note that this mission wouldn't actually return the samples to Earth, but simply collect them.