If you haven't already subscribed to the SETI Talks YouTube channel -
SETI Institute - then I'd recommend it strongly for those who have an interest in astronomy. Been following this one for while, but have have fallen behind a bit; need to work my way through the back log I think.
Weekly-ish lectures, usually an hour or so long by expert speakers. Mostly planetary astronomy - Mars, Titan, outer solar system objects and so on as well as talks on various missions that are currently active or planned. Some more cosmology-orientated talks too now and again. And much more.
Get subscribin'..