Author Archives: Mark Zastrow

Sunspot and granulation from Hinode

Old, Fat Stars Flicker

Observing the pattern of flickers in a star’s light offers a new way for astronomers to measure one of the basic properties of stars — and any exoplanets they might host.

An artist's rendering of the hot Jupiter HAT-P-7b.

How to Toast a Planet

A new study suggests that close-in gas giants may heat up electrically like toaster coils plugged in to their host stars via the power lines of the stellar wind — explaning why the planets inflate.