Can we travel through time? This is not a frivilous, science-fiction
kind of question. Certain restricted kinds of time travel are in fact
allowed by classical General Relativity. This lectures takes up this
question, and looks at some of the surprising answers that have been
found. Recorded 2006 March 8 in 1008 Evans Laboratory on the Columbus
campus of ... Show More
Mar 2006
Lecture 41: Dark Matter & Dark Energy
We are not made of the same matter as most of the Universe! This
surprising conclusion, that the ordinary matter we are made of (protons,
neutrons, and electrons) constitute only 13% or so of the total matter
in the Universe, the rest being in the form of Dark Matter. Further,
th ... Show More
43m 31s
Jun 2009
Telescopes that Rocked Our World
This year marks the 400th anniversary of Galileo’s use of the first telescope. On this week’s show, we reflect on how telescopes have shifted our perspective on how small we are in size, space, and time. We also discuss how they help astronomers discover new and interesting aspec ... Show More
56 m