San Francisco, California
London, United Kingdom
Tuesday, February 18 2014 - 12:00 pm, PST
One of the greatest accomplishments in recent astrophysics is the
creation of a model for the complete inventory of the Universe. All
the observational data tells us with extremely high certainty that
ordinary matter (every particle ever detected by every person who ever
lived) makes up only one fifth of all the matter there is. The rest
goes by the popular name of dark matter. Because it is dark, dark
matter has been notoriously hard to detect; it doesn't emit or reflect
radiation such as light or heat, and it can have only the feeblest of
interactions with itself and ordinary matter. So how do we know it is
there? In this talk, I will discuss how astronomers observe the invisible
matter in one of the true gems on the sky: a giant cluster of galaxies also called the Bullet Cluster.
When & Where
The mission of the SETI Institute is to explore, understand and explain the origin, nature and prevalence of life in the universe.
We believe we are conducting the most profound search in human history — to know our beginnings and our place among the stars.
The SETI Institute is a private, nonprofit organization dedicated to scientific research, education and public outreach.
Every week the SETI Institute hosts a lecture series that is open to the public and gives people a unique opportunity to interact with some of the world's leading space scientists.
For past videos, upcoming events and full event details, go to seti.org/talks.