Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on cometary surface evolution derived from a statistical
  analysis of 67P's topography   We present a statistical analysis of the distribution of large scale
topographic features on comet 67P/Churyumov-Gerasimenko. We observe that the
cumulative cliff height distribution across the surface follows a power law
with a slope equal to -1.69 +- 0.02. When this distribution is studied
independently for each region, we find a good correlation between the slope of
the power law and the orbital erosion rate of the surface. For instance, the
northern hemisphere topography is dominated by structures on the 100~m scale
while the southern hemisphere topography, illuminated at perihelion, is
dominated by 10~m scale terrain features. Our study suggest that the current
size of a cliff is controlled not only by material cohesion but by the dominant
erosional process in each region. This observation can be generalized to other
comets, where we argue that primitive nuclei are characterized by the presence
of large cliffs with a cumulative height power index equal to or above -1.5,
while older, eroded cometary surfaces have a power index equal to or below
-2.3. In effect, our model shows that a measure of the topography provides a
quantitative assessment of a comet's erosional history, i.e. its evolutionary
age.

3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg