APOD.pl: astronomiczne zdjęcie dnia

Codziennie nowy obraz lub zdjęcie naszego fascynującego Wszechświata
wraz z krótkim objaśnieniem napisanym przez zawodowego astronoma.
Zobacz więcej!

20 lipca 2005
Zobacz opis. Po kliknięciu na obrazek załaduje się wersja
 o największej dostępnej rozdzielczości.

Water Ice in a Martian Crater
Źródło: G. Neukum (FU Berlin) et al., Mars Express, DLR, ESA;
prawa autorskie: Nature

Opis: What lies on the floor of this Martian crater? A frozen patch of water ice. The robotic Mars Express spacecraft took the above image in early February. The ice pocket was found in a 35-kilometer wide crater that resides 70 degrees north of the Martian equator. There, sunlight is blocked by the 300-meter tall crater wall from vaporizing the water-ice on the crater floor into the thin Martian atmosphere. The ice pocket may be as deep as 200 meters thick. Frost can be seen around the inner edge on the upper right part of the crater, while part of the lower left crater wall is bathed in sunlight. The existence of water-ice pockets inside craters near the Martian North Pole, like that pictured above and others noted previously, give clues not only about surface conditions in the Martian past but also possible places where future water-based astronauts might do well to land.

Jutro: 47 Tuc W


< | Archiwum | Lista tematyczna | Szukaj | Kalendarz | Słownik | Edukacja | O APOD | Forum | >

Autorzy i wydawcy: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: EUD at NASA / GSFC
& Michigan Tech. U.