Lincoln Greenhill: Moving Images of Accretion and Outflow in High-Mass Star Formation

Colloquium: Astronomy Colloquia | November 5 | 4:10-5 p.m. | 2 LeConte Hall

Speaker/Performer: Lincoln Greenhill, CfA

Sponsor: Astronomy, Department of

The details of how massive stars form are poorly understood. Testing
the viability of disk-mediated accretion, and identifying the processes
that extract angular momentum benefit from direct measurement
of the dynamics of gas at small radii, where outflows are launched and
collimated. Using the VLBA and VLA, and for the first time, we have
traced gas structures and tracked...   More >

Mate Adamkovics, tba

Colloquium: Astronomy Colloquia | November 12 | 4:10-5 p.m. | 2 LeConte Hall

Speaker/Performer: Mate Adamkovics, UCB

Sponsor: Astronomy, Department of

The interaction of photosynthesis with the crust and mantle and the effect of the moon-forming impact on the current Earth

Colloquium: Astronomy Colloquia | November 19 | 4:10-5 p.m. | 2 LeConte Hall

Speaker/Performer: Norm Sleep, Stanford

Sponsor: Astronomy, Department of

Photosynthesis evolved before 3.8 billion years ago. Rocks of that
age include metamorphosed black shales with pyrite showing that
sulfur based and iron based photosynthesis existed. A complete carbon
cycle existed on land and at sea. The land biota needed FeO to dump
oxygen. A consortium with efficient weathering evolved to obtain the
FeO from exposed rocks. Weathering in...   More >