Rare asteroidal vesicular basalts have previously been thought to form in surficial lava flows with CO as the vesicle-forming gas. However, vesicular lava flows are unlikely on small, airless bodies such as asteroids. To unravel the origin of these rocks, we analyzed vesicle sizes and abundances for two angrites and two eucrites using high-resolution X-ray computed tomography and conducted nume...

A graph is an interval graph if it is the intersection graph of intervals on a line. Interval graphs are known to be the intersection of chordal graphs and asteroidal triple-free graphs, two families where the well-known Lexicographic Breadth First Search (LBFS) plays an important algorithmic and structural role. In this paper we show that interval graphs have a very rich LBFS structure and tha...

Kayles is a combinatorial game on graphs. Two players select alternatingly a vertex from a given graph G a chosen vertex may not be adjacent or equal to an already chosen vertex. The last player that can select a vertex wins the game. The problem to determine which player has a winning strategy is known to be PSPACE-complete. Because of certain characteristics of the Kayles game, it can be anal...

The Planck mission, originally devised for cosmological studies, offers the opportunity to observe Solar System objects at millimetric and submillimetric wavelengths. We concentrate in this paper on the asteroids of the Main Belt, a large class of minor bodies in the Solar System. At present more that 40000 of these asteroids have been discovered and their detection rate is rapidly increasing. ...

schmelzens, und sind die Tektite von ähnlichem Ausgangsstoff abzuleiten, dann muß man jedoch Fraktionierung von Rb und Sr annehmen, um die Abweichung der Tektitenresultate von der „Isochrone" der Gläser zu erklären. Demnach ist es nicht möglich, genauere Folgerungen aus unseren Messungen hinsichtlich des Ursprungs der EK-Tektite zu gewinnen. Es ist jedoch gesichert, daß eine deutliche Ähnlichke...