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Until a few years ago, our only data about Mercury came from Earth-based observations and the 1970s flyby of the The main image shows the disk of the Sun during the November 8, 2006 Mercury transit.The gray box shows the view of the time-lapse insets at the top of the montage. Mercury is the small dot that starts near the bottom of the slice. Photographs were taken and processed by Stuart Robbins.Being the closest planet to the Sun as well as the smallest planet, Mercury is very difficult to observe.To see it, you generally can only observe it very close to sunset or to sunrise (depending upon which side of the Sun it appears to be on).So uniquely specifying a system based on this is wrong. You can't get any depth information out of it which makes the number of matches go up even more.Another problem is that you're talking about a 2D projection of a 3D distribution. To those steeped in UFO lore, you may remember the Betty and Barney Hill "star map" issue, which has the same problem: Betty drew in 2D a 3D star map she allegedly saw, and then a school teacher somehow converted that back into 3D and claimed she found where the aliens were from that allegedly abducted the Hills. Absolute versus Relative Ages The first necessary part of this discussion is about the concept of relative versus absolute ages.
In March, Curiosity drilled holes into the mudstone and collected powdered rock samples from two locations about three meters apart.The work, led by geochemist Ken Farley of the California Institute of Technology (Caltech), could not only help in understanding the geologic history of Mars but also aid in the search for evidence of ancient life on the planet.Many of the experiments carried out by the Mars Science Laboratory (MSL) mission's Curiosity rover were painstakingly planned by NASA scientists more than a decade ago. Keck Foundation Professor of Geochemistry and one of the 29 selected participating scientists, submitted a proposal that outlined a set of techniques similar to those already used for dating rocks on Earth, to determine the age of rocks on Mars.Mercury's surface is covered with craters, including the giant Caloris Basin.Mercury posessess a magnetic field as well as a large iron core, making it an anomaly that planetary scientists are still trying to understand.