Calendar

May
31
Tue
Colloquium PhD Defense: Diane Feuillet
May 31 @ 3:00 pm – 4:00 pm
Colloquium PhD Defense: Diane Feuillet @ Dominici106

Ages and Abundance of Local Stellar Populations

Diane Feuillet, NMSU

Mar
28
Tue
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.

 

Sep
8
Fri
Planetary Group meeting
Sep 8 @ 10:30 am – 11:30 am
Sep
22
Fri
Planetary Group meeting
Sep 22 @ 10:30 am – 11:30 am
Oct
6
Fri
Planetary Group meeting
Oct 6 @ 10:30 am – 11:30 am
Oct
20
Fri
Planetary Group meeting
Oct 20 @ 10:30 am – 11:30 am
Nov
3
Fri
Planetary Group meeting
Nov 3 @ 10:30 am – 11:30 am
Nov
17
Fri
Planetary Group meeting
Nov 17 @ 10:30 am – 11:30 am
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

Feb
12
Mon
Planetary Group meeting
Feb 12 @ 3:00 pm – 4:00 pm