Bullet Galaxies and Dark Matter - Marusa Bradac (SETITalks)
Μετάδοση με ζωντανή ροή στις 18 Φεβ 2014
Because of technical difficulties, we were unable to record the lecture slides during this talk. You can download the slides at http://multimedia.seti.org/marusa-bra... , and follow along with the presentation.
Speaker: Marusa Bradac, UC Davis
Abstract:
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.
Speaker: Marusa Bradac, UC Davis
Abstract:
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.
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 19/2/2014
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