Calendar

Oct
23
Wed
Astro-ph Discussion
Oct 23 @ 1:00 pm – 1:30 pm
Astro-ph Discussion @ AY119
Oct
24
Thu
Planetary Group meeting
Oct 24 @ 4:00 pm – 5:00 pm
Oct
25
Fri
Astro-ph Discussion
Oct 25 @ 11:30 am – 12:00 pm
Astro-ph Discussion @ AY119
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.

Oct
28
Mon
Pizza Lunch: Sultan Hassan
Oct 28 @ 12:30 pm – 1:30 pm
Pizza Lunch: Sultan Hassan @ AY 119

Title

Oct
30
Wed
Astro-ph Discussion
Oct 30 @ 1:00 pm – 1:30 pm
Astro-ph Discussion @ AY119
Nov
1
Fri
Astro-ph Discussion
Nov 1 @ 11:30 am – 12:00 pm
Astro-ph Discussion @ AY119
Colloquium: OPEN (Host: TBD)
Nov 1 @ 3:15 pm – 4:15 pm
Colloquium: OPEN (Host: TBD) @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

Abstract text

Nov
4
Mon
Pizza lunch: Laurel Farris
Nov 4 @ 12:30 pm – 1:30 pm
Pizza lunch: Laurel Farris @ AY 119

Title

Nov
6
Wed
Astro-ph Discussion
Nov 6 @ 1:00 pm – 1:30 pm
Astro-ph Discussion @ AY119