Credit & Copyright: Noel Donnard
Explanation:
Point your telescope
at tonight's first quarter Moon.
Along the terminator,
the shadow line between night and day,
you might find these two large craters
staring back at you with
an owlish gaze.
Alphonsus
(left) and
Arzachel
are ancient impact craters on
the north eastern shores of Mare Nubium, the lunar Sea of Clouds.
The larger Alphonsus is over 100 kilometers in diameter.
A low sun angle highlights the crater's
sharp 1.5 kilometer high central
peak in bright sunlight and dark shadow.
Scouting for potential Apollo moon landing sites, the
Ranger 9 spacecraft
returned closeup photographs of Alphonsus before
it crashed in the crater just northeast (left) of its central mountain in 1965.
Alpetragius,
between Alphonsus and Arzachel,
is the small crater with the deeply shadowed floor and
overly large central peak.
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Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Публикации с ключевыми словами:
Moon - Луна - кратер
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