Barrancs congelats del pol nord de Plutó

La imatge enregistrada durant el seu pas a prop de Plutó per la sonda New Horizons de la NASA, ens mostra la diversitat de Plutó, amb diferents característiques geològiques i que podem observar en aquest fotografía en color millorat.

Observem llargs i verticals barrancs que transcorren a través de la zona polar, en la regió de Lowell Regio, anomenada així, en honor a Percival Lowell, que va construir l’Observatori Lowell i que va conduir al descobriment del planeta nan. La majoria d’aquests barrancs tenen uns 75 quilòmetres de llargada, mostrant-se subsidiaris entre ell pararel·lament en dirección est-oest i amb uns 10 quilòmetres d’amplada.

Les parets degradades d’aquests barrancs semblen molt més definits que d’altres situats en altres regions de Plutó, probablement per ser més antics i haver estar més erosionats. Aquests barrancs semblen representar un antic període de processos  tectònics.

El color d’aquesta imatge ha estat millorada i contrastada, de manera que les regions altes apareixen en un color groguenc, aquest color s’esvaeix a un gris blavós uniforme en elevacions més baixes. Els mesuraments infrarojos de la New Horizons, mostren que el gel de metà és abundant a Lowell Regio, mentre que hi ha poc gel de nitrogen. Una possibilitat és que els terrenys mostrats en color groguenc poden correspondre a dipòsits de metà de més edat, produïts per la radiació solar exposada més temps, que no pas en les regions de color gris blavós.

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