Happy birthday, Carl Sagan. Wish you were here.

Today would have been Carl Sagan's 84th birthday. I wish he were here.

Watch the above, climb aboard your Ship of the Imagination, and make the future.

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My dear wonderful dad would be 84 today. I find that very hard to imagine. I spend a lot of time wondering what he would be like as an old man. I wish I could know that version of him. Just as I wish I could know the version of him pictured here, young and full of promise. I miss all the versions of him. The ones I knew and the ones I didn't. Thank you to everyone who knew him and everyone who didn't who still misses him, who still reads his work, who still thinks of him. It means a lot. #carlsaganday

A post shared by Sasha Sagan (@sashasagan) on Nov 9, 2018 at 7:12am PST

We're celebrating #CarlSagan's birthday by sharing his "lost lecture", the talk he gave at his 60th birthday symposium @Cornell @CornellCAS. Today is the perfect day to celebrate the #CarlSagan vision, which inspired @CSInst https://t.co/lxvgKQEvL5

- Carl Sagan Institute (@CSInst) November 9, 2018

Astronomer, cosmologist, astrophysicist, astrobiologist, author, science popularizer, communicator, father, friend, and our co-founder.

Here's to the man who inspired us to deal more kindly with one another and to preserve and cherish our pale blue dot. #CarlSaganDay pic.twitter.com/ZwrcnGPHgD

- Planetary Society (@exploreplanets) November 9, 2018