Six pages into comments, and I became impatient, so pardon me if others have posted these:
1. I do not know if the measure tool on Google Earth is calibrated for planet viewing, but the object measures right around 200 meters in length
using that tool.
2. Backing off (note how Google Earth altitude is obviously not calibrated for Mars view) gives a better view. The algorithm used to calculate
altitude most certainly effects the measurement tool.
3. Other sources have been posted showing the same object as it appears in Google Earth, so we can cease the debate about a Google hoax.
4. We do not have the technology to send men to Mars. If we did, we would not be wasting huge amounts of money on ISS and STS missions, would we?
5. Concerning if we could be looking at a rocket stage which impacted there after delivering a orbital or lander payload (if anyone may have thought
of that): any such man-made object would be far too small to show up except perhaps as a bright dot of light.
6. A brief post by some user stated that the same image appears on earth at the same coordinates. No. Neither does that series of pixels show up on
the Lunar view. Besides, see item 3, above.
7. A database I found indicating locations of man-made debris on Mars does not show anything near this position. See:
Mars debris and lander sites
As I hinted at in the first two items, the altitude provided by Google Earth allows you to zoom in to about a MINUS 17,000
feet-- the apparent "surface" level. No matter what altitude one uses, the object measures right around 200 meters. That suggests to me that the
displayed altitude for whatever zoom level one chooses is not a number used to calculate measurement when using the ruler tool.
Google Earth Measurement of object = 200 meters
Mars diameter/radius: 6790/3395 kilometers
Earth diameter/radius: 12670/6335 kilometers
If the algorithm used to calculate measurement is based, not upon altitude, but from arc seconds-- essential calculating from the center of the
planet-- then correcting the algorithm (if any is required) may cause us to suspect that the measurement tool is over-estimating the size, because the
shortest distance between two lines making up an angle gets greater the farther from the intersection one measures.
So, If Google Earth calculates measurement between two points on Mars based upon degree of separation but, erroneously using Earth's diameter, then
it is calculating the distance between two points on an angle about 2940 kilometers beyond the actual (the difference between surface level of earth
and of Mars if those imaginary surfaces were calculated from the same central point). The actual length of object can be determined by cross
multiplication as: 200/6335 = x/3395; thus x = ~107 meters.
Conclusion (unless someone has more data):
We are not looking at anything man-made. I do not believe we have sent even a booster of near that
length. 100 meters would be typical of a booster needed to escape earth's gravity, but a trans-Mars stage would not be so large, would it?