Calendar

Dec
4
Mon
Pizza Lunch: Karen Kinemuchi
Dec 4 @ 12:30 pm – 1:30 pm
Pizza Lunch: Karen Kinemuchi @ AY 119

Life at Apache Point Observatory

Nov
12
Mon
Pizza lunch: Nur Berdalieva and Shukur Kholikov
Nov 12 @ 12:30 pm – 1:30 pm
Pizza lunch: Nur Berdalieva and Shukur Kholikov @ AY 119

Past and Present Astronomy in Uzbekistan

Nur Berdalieva (Astronomical Institute of Uzbekistan) and Shukur Kholikov (National Solar Observatory)

Oct
25
Fri
Colloquium: Shun Karato (Host: Jason Jackiewicz)
Oct 25 @ 3:15 pm – 4:15 pm
Colloquium: Shun Karato (Host: Jason Jackiewicz) @ BX102

Solving the Puzzles of the Moon

Shun Karato, Yale University

After 50 years from the first landing of men on the Moon, about 380 kg of samples were collected by the Apollo mission. Chemical analyses of these samples together with a theory of planetary formation led to a “giant impact” paradigm (in mid 1970s). In this paradigm, the Moon was formed in the later stage of Earth formation (not the very late stage, though), when the proto-Earth was hit by an impactor with a modest size (~ Mars size) at an oblique angle. Such an impact is a natural consequence of planetary formation from a proto-planetary nebula. This collision may have kicked out mantle materials from the proto-Earth to form the Moon. This model explains mostly rocky composition of the Moon and the large angular momentum of the Earth-Moon system. High temperatures caused by an impact likely removed much of the volatile components such as water.

However, two recent geochemical observations cast doubt about the validity of such a paradigm. They include (i) not-so-dry Moon suggested from the analysis of basaltic inclusions in olivine, and (ii) the high degree of similarities in many isotopes. The first observation is obviously counter-intuitive, but the second one is also hard to reconcile with the standard model of a giant impact, because many models show that a giant impact produces the Moon mostly from the impactor. In this presentation, I will show how one can solve these puzzles by a combination of physics/chemistry of materials with some basic physics of a giant impact.

Jan
27
Mon
Pizza Lunch: Candace Gray
Jan 27 @ 12:30 pm – 1:30 pm
Pizza Lunch: Candace Gray @ AY 119

APO Open House Info

Candace Gray