Calendar

Mar
27
Mon
Pizza Lunch: Tom
Mar 27 @ 12:30 pm – 1:15 pm
Pizza Lunch: Tom @ AY 119

Something about CVs so Jason gets a break…. and to bore the rest of you to death.

Planetary Group meeting
Mar 27 @ 2:30 pm – 3:30 pm
Mar
28
Tue
Inclusive Astronomy
Mar 28 @ 12:00 pm – 1:00 pm
Joint Physics/Astronomy Colloquium: William Newman
Mar 28 @ 4:00 pm – 5:00 pm
Joint Physics/Astronomy Colloquium: William Newman @ Gardiner Hall 229, Physics. Dept. | Ames | Iowa | United States

Giant Planet Shielding of the Inner Solar System Revisited: Blending Celestial Mechanics with Advanced Computation

Dr. William Newman, UCLA

The Earth has sustained during the last billion years as many as five catastrophic collisions with asteroids and comets which led to widespread species extinctions. Our own atmosphere was literally blown away 4.5 billion years ago by a collision with a Mars-sized impactor. However, collisions with comets originating in the outer solar system accreted much of the present-day atmosphere. Relatively advanced life on our planet is the beneficiary of a number of impact events during Earth’s history which built our atmosphere without destroying a large fraction of terrestrial life. Using very high precision Monte Carlo integration methods to explore the orbital evolution over hundreds of millions of years followed by the application of celestial mechanical techniques, the presentation will explain directly how Earth was shielded by the combined influence of Jupiter and Saturn, assuring that only 1 in 100,000 potential collisions with the Earth will materialize.

 

Mar
29
Wed
Astro-ph Discussion
Mar 29 @ 2:30 pm – 3:00 pm
Mar
30
Thu
Galaxy Group
Mar 30 @ 12:00 pm – 12:30 pm
Mar
31
Fri
PDS Atmospheres Node meeting
Mar 31 @ 9:00 am – 10:00 am
Colloquium PhD Defense: Sean Markert
Mar 31 @ 3:15 pm – 4:15 pm
Colloquium PhD Defense: Sean Markert

Gravitational Lensing of Clusters of Galaxies,

Dr. S. Markert, NMSU

Apr
1
Sat
Cume #415
Apr 1 @ 10:00 am – 12:00 pm
Apr
3
Mon
Pizza Lunch: Nancy Chanover & James McAteer
Apr 3 @ 12:30 pm – 1:30 pm
Pizza Lunch: Nancy Chanover & James McAteer

The AAS: What Has it Done for You Lately?