Je was op zoek naar: phobos (Engels - Sloveens)

phobos
fobos

this points to mars and one of its moons, and phobos is more likely than deimos because it is closer to mars.
=== eliptična geometrija ===leta 1854 je bernhard riemann predstavil svoje ideje: v znamenitem predavanju je predstavil svoje poglede na geometrijo mnogoterosti.

in parallel, an agreement has also been concluded with the russian federal space agency for cooperation with the russian sample return mission from phobos, a moon of mars.
vzporedno s tem je bil sklenjen sporazum z vesoljsko agencijo ruske federacije o sodelovanju z rusko misijo za vračanje vzorcev s phobosa, marsove lune.

the crater d'arrest on the moon is named after him, as well as a crater on the martian satellite phobos and the asteroid 9133 d'arrest.
včasih njegovo ime navajajo kot heinrich ludwig d'arrest.