“Catalyst” explores cracks on the icy surface of Jupiter’s moon Europa that suggest an ocean swirls underneath.
Join the popular royal historian for an exclusive tour of London's most extraordinary palaces. From the forbidding Tower of London to glorious Hampton Court to treasure-filled Kensington Palace, Lucy takes viewers behind the velvet ropes into each building's most secret places.
Set in Amsterdam, new series "Van Der Valk" follows the work of Commisaris Van der Valk (played by Marc Warren), a street-smart and unapologetic Dutch detective who navigates the lively and enigmatic city, solving mysterious crimes using astute human observation and inspired detection.
"Nova" explores new discoveries and how we have come this far on Wednesdays at 8 p.m. on Arizona PBS.