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.

 

Jan
18
Thu
ASTR 605 – Interstellar Medium
Jan 18 @ 8:55 am – 10:10 am
Jan
19
Fri
ASTR 630 – Astronomy Statistical Analysis
Jan 19 @ 9:30 am – 10:20 am
Jan
22
Mon
ASTR 630 – Astronomy Statistical Analysis
Jan 22 @ 9:30 am – 10:20 am
ASTR 621 – Planetary Science II
Jan 22 @ 11:00 am – 12:15 pm
ASTR 625 – Cosmology
Jan 22 @ 1:30 pm – 2:45 pm
Jan
23
Tue
ASTR 605 – Interstellar Medium
Jan 23 @ 8:55 am – 10:10 am
ASTR 500 – Graduate Seminar
Jan 23 @ 11:50 am – 12:50 pm
Jan
24
Wed
ASTR 630 – Astronomy Statistical Analysis
Jan 24 @ 9:30 am – 10:20 am
ASTR 621 – Planetary Science II
Jan 24 @ 11:00 am – 12:15 pm