Sep

17

2017

Prof. David Jewitt

From the Edge of the Solar System

Location: Geology 3656
Time: 2:30PM

We have discovered that a new comet, C/2017 K2, is active at record distance from the Sun. It appears to be making its debut in the planetary region, following 4.5 billion years in the frigid Oort cloud. David Jewitt will discuss the new object and describe what we know about the outer realms of the solar system.

Aug

27

2017

Dr. Paul Warren

Meteorites from Mars and on Mars

Location: Geology 3656
Time: 2:30PM

Martian meteorites are key sources of information about the Red Planet, especially its volcanic history. Ar and N isotopic ratios show the martian connection. Even though there are fewer martian meteorites (about 110) than lunar meteorites (140), the tally for meteorite falls is 5 martians to zero lunars. Rovers have analyzed a few meteorites among the cobbles on the martian surface. Photo credit: NASA/JPL-Caltech/LANL/CNES/IRAP/LPGNantes/CNRS/IAS/MSSS

Aug

21

2017

Solar Eclipse watching event

Astronomy and Planetary Science

Location: Court of Sciences
Time: 9:30AM

People in Los Angeles will be able to see a partial solar eclipse, as long as clouds do not obstruct the view. UCLA’s public event will be run from 9:30 to 11:30 a.m. on Monday, Aug. 21. The maximum point of the eclipse will be at 10:20 a.m., when the moon will obscure about 60 percent of the sun. At 11:44 a.m., the moon will complete its journey across the sun. The event will be held at the campus’s Court of Sciences. UCLA will have specially filtered solar telescopes that protect the eyes while revealing stunning details of the sun, such as enormous clouds of ejected solar material, and surface features such as sunspots, which can be larger than the Earth. There will also be live images of the solar eclipse projected onto a white screen that will enable participants to take eclipse photos. UCLA scientists in astronomy and planetary sciences will be available to answer questions about the sun, the eclipse, the solar system and astronomy. A limited number of eclipse glasses will be provided. More info can be found here: http://www.newsroom.ucla.edu/releases/ucla-scientists-invite-public-to-free-eclipse-watching-event. Photo: NASA

Jul

16

2017

Prof. David Paige

Ice deposits at the poles of the Moon and Mercury

Location: Geology 3656
Time: 2:30PM

Surficial ice evaporates relatively quickly if exposed to sunlight in the inner solar system. However, some parts of craters near the poles of Mercury and the Earth’s Moon are in permanent shadow. If a water molecule lands in such a spot it is expected to stay there until it evaporates due to heat from a micrometeorite or a photon from a star other than the Sun. New spacecraft data support the interpretation that there is ice in these shadowed regions. Picture: Lunar mosaic of the south pole (GSFC/NASA/Arizona State University)

Jun

25

2017

Dr. Frank Kyte

Eltanin, the largest meteorite of which intact fragments are preserved

Location: Geology 3656
Time: 2:30PM

The largest recovered meteorite was discovered at the bottom of the Pacific Ocean about 1500 km west of the southern tip of South America. It has been documented by sediment cores collected during a series of German oceanographic cruises. About 2.5 million years ago a one-kilometer-diameter asteroid impacted the ocean and deposited more than one kilogram of meteorites per square meter over thousands of square kilometers. About 90% of this was melted by the shock of the impact, but 10% is undamaged meteorite fragments.