February 17, 2005 photo by Anna
Processed by BJ Scofield.
February 22, 2005 Photo by Ellenor
Processed by Kevil Murray.
<> During the recent two
weeks of evening moon visibility, there were only two nights suitable
for photography by students in Physical Science Class. Notice the
drastic difference in appearance 5 days makes!
The moon was
a little more than half full in the Feb. 17 image. The sun illuminates
the moon from
the right (west). The mountains and craters near the terminator
are highly pronounced due to the shadows. These shadowed areas
are the "sunrise" on the moon. The arc of mountains in the upper
left of the Feb. 17 image are the Apennine mountains with Mare Imbrium
half obscured by the terminator left of the Apennines.
The moon was nearly full in the Feb. 22 image when the sun is
illuminating the moon from almost behind the observer. With the
sun angle in line with the observer, notice there are no shadows -
hence the relief features are barely noticeable during the full
moon. On the other hand, notice that several craters show rays of
ejecta as lighter lunar material was excavated during the catastrophic
impact events and dispersed as rayed deposits in all directions.
The most recent event formed the crater Tycho very promiment in the
lower center of the full moon photograph. This event is believed
to have occured "only" 100 million years ago (http://stardate.org/resources/gallery/gallery_detail.php?id=5).
find Tycho on the Feb. 17 image?
Other features to note are: Mare Crisium near the right-hand limb of
the moon and the nearly circular Mare Serenatatis in the upper center
of the moon.
Physics Photo of the Week is
published weekly during the academic year on Fridays by the Warren
Wilson College Physics
Department. These photos feature an interesting phenomena in
the world around us. Students, faculty, and others are invited to
submit digital (or film) photographs for publication and
explanation. Atmospheric phenomena are especially welcome.
Please send any photos to firstname.lastname@example.org.