A Giant Surprise about Extrasolar Planets
Giant stars with planets often have smaller amounts of
heavy elements than the Sun, say astronomers in the
United States and Germany. This trend is surprising:
it is opposite the one seen in planet-bearing
main-sequence stars and suggests stars more massive
than the Sun may give birth to planets in a different
way.
The full story is at
http://KenCroswell.com/AGiantSurprise.html