While Curiosity has been hogging a lot of attention lately, the Opportunity rover is still roving away elsewhere on Mars (since 2004!). Kind of like the Energizer bunny, it just keeps going and going and going…
Category Archives: Opportunity
With all of the attention that Curiosity has been getting, we might almost forget sometimes that there is still another rover elsewhere on the planet, Opportunity, which is still going strong – in its ninth year now!
When the Opportunity rover first landed on Mars in 2004, one of the first discoveries it made was that the ground was covered by tiny, round spherules up to a few millimetres in diameter. Also found imbedded in rock outcrops, they were an unexpected and fascinating surprise. What were they?
After extensive analysis by the rover, it was concluded by the scientists involved that they were concretions – little bb-like iron-oxide spherules similar to those found on Earth, notably those in the Navajo Sanstone deposits in Utah. The Martian ones also contain the mineral hematite, explaining the hematite signature seen in this region from orbit by the Mars Reconnaissance Orbiter spacecraft.
See Examiner.com for the full article.
The Opportunity rover has moved on a bit from Kirkwood, the previous rock outcrop with the new type of spherules in it that the scientists have taken so much interest in. It is now examining another odd-looking feature, a rather flat exposure of rock just a little to the north. Nicknamed Whitewater Lake, it is much lighter in colour than the surrounding rocks and soil and has a surface texture not seen before, sort of like stucco or plaster of Paris. Could it also be water or clay related? Only further analysis will hopefully provide some answers.
Next to Whitewater Lake is another interesting rock, nicknamed Errington, which is split into at least three large pieces and appears to be covered with the same tiny spherules first seen a bit farther south on the Kirkwood rock outcrop.
Is there a connection between these very different types of rock outcrops? They look so different but are so close together. Are they related to the clay deposits in the area? We should know more soon… Thanks again to Stuart Atkinson for use of his excellent mosaic images.