physics

Exoplanets and the Search for Extraterrestrial Life

Variable Stars and the Stories They Tell: Exoplanets and the Search for Extraterrestrial Life

©February 2018 by Dale Alan Bryant

(In memory of M.I.T. astrophysicist Dr. Philip Morrison - who started all this...)

 

Though the figures are tough to keep up with - they are changing, almost daily - the Kepler Space Telescope (KST) has discovered, to date, over 4,500 exoplanet candidates, ~3,400+ of which have been confirmed.

The Cosmic Distance Ladder

Distances in the universe are so vast that we do not have a simple way of measuring them.  For distances within the solar system we can measure them directly, using radar for example, and some very straightforward trigonometry.  But radar is hard to use when it takes light minutes or hours to cross the solar system; and the nearest star is four light years awa