The "fixed stars" are really in constant motion, but these motions
are too small to see with the human eye in a human lifetime. This
lecture introduces proper motions (apparent angular motion of the
stars in the sky), radial velocities (motion towards or away from
us measured using the Doppler Shift of the star's spectral lines),
and true space velocities, ... Show More
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