May

14

2017

Prof. Kevin McKeegan

The Great American Eclipse of 2017

Location: Geology 3656
Time: 2:30PM

On Monday, August 21, 2017, a total eclipse of the Sun will be visible in the continental United States for the first time in almost 40 years. During a total eclipse the Sun is completely hidden by the Moon, the sky becomes dark, and the faint atmosphere (corona) becomes visible - looking like a beautiful halo. The eclipse will be total along a track stretching from Oregon to South Carolina. In Los Angeles the eclipse will be only partial with 2/3 of the Sun being eclipsed. Kevin will discuss a few historically important eclipses, some general eclipse phenomena, and where and how to view the total eclipse. Photo credit: NASA

Apr

23

2017

Dr. Steve Chesley

The Osiris Rex sample-return mission to the asteroid Bennu, a probable source of carbonaceous chondrites

Location: Geology 3656
Time: 2:30PM

The Osiris Rex mission was launched in September 2016. It will rendezvous with Asteroid Bennu in 2018 and spend 1.5 years mapping the surface. It will then sample the surface and return 60-2000 g to the Earth in 2023. It is the first US asteroid sampling mission.