Calendar

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.

 

Aug
16
Wed
ASTR 535 – Observational Techniques I
Aug 16 @ 9:30 am – 10:20 am
ASTR 670 – Heliophysics
Aug 16 @ 11:00 am – 12:15 pm
Aug
17
Thu
ASTR 565 – Stellar Interiors
Aug 17 @ 11:45 am – 1:00 pm
Aug
18
Fri
ASTR 535 – Observational Techniques I
Aug 18 @ 9:30 am – 10:20 am
Aug
21
Mon
ASTR 535 – Observational Techniques I
Aug 21 @ 9:30 am – 10:20 am
ASTR 670 – Heliophysics
Aug 21 @ 11:00 am – 12:15 pm
Aug
22
Tue
ASTR 565 – Stellar Interiors
Aug 22 @ 11:45 am – 1:00 pm
Aug
23
Wed
ASTR 535 – Observational Techniques I
Aug 23 @ 9:30 am – 10:20 am
ASTR 670 – Heliophysics
Aug 23 @ 11:00 am – 12:15 pm