Happy Birthday Carl Sagan!

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Today marks the 77th birthday of the late scientist and author, Carl Sagan. A lot of us probably owe much of our understanding of space and astrophysics to this man. Thanks, Carl. Happy Birthday!

Happy Birthday, Matt Smith!

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Happy Birthday to Matt Smith who turns 29 today! Birthday's are cool!

Gifs via ourtimedmoment, aimlessowl

Happy Birthday, David Tennant!

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David Tennant turns 41 today. Yes, he's 41 years old and still looks that damn good. He's Barty Crouch Jr., Cassanova, a phenomenal Hamlet, and of course, one of our favorite Doctors. He's also a huge fan of "Doctor Who", and credits the show for getting him interested in acting in the first place. All we can say is Happy Birthday, and thanks for making seasons two, three, and four so much fun to watch.

Happy birthday, David Tennant!

Happy Birthday Leonard Nimoy!

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Leonard Nimoy turns 81 years old today. He introduced us to Spock, directed one of the best "Star Trek" films, and sang us the story of "The Hobbit." He's done so much, it's almost impossible to list every accomplishment here. He's even still going strong in the sci-fi world with a recurring role in "Fringe." Thanks for all you've given us sci-fi fans, Leonard. Happy Birthday!

Happy Birthday, Karen Gillan!

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Karen Gillan, who plays Amy Pond on "Doctor Who," is 24 years old today. Happy birthday, Pond!

Happy Birthday, George Takei!

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George Takei turns 75 years old today. Beginning his career at a time when Asian characters on televison were extremely rare, he started out with small one-off roles in a few popular TV shows. As we all know, he eventually landed the role of Hikaru Sulu and was responsible for the character's swashbuckling fantasies that led to the scene pictured above. Outside of "Star Trek," he is an accomplished actor and activist, working for gay rights, Japanese American rights, and even getting "Star Trek" and "Star Wars" fans to stop bickering and focus on a common enemy. Clearly, it's not just okay to be Takei, it's pretty awesome.

He is also incredibly active on the internet, and there is a chance he's reading this right now. If you are George, we just want to say thanks for everything you've done, both on and off screen, and happy birthday!