Today is National Space Day ... It’s kind of a big day. There is Outer Space and there is Inner Space. The space within is just as Big as the Space without. Let’s celebrate this massively big and infinite

Think of tests by which you might systematically disprove each of the alternatives #CarlSagan

#Science is a way of thinking much more than it is a body of knowledge #CarlSagan

The obvious is sometimes false; the unexpected is sometimes true #CarlSagan

Inveterate skeptics must be given the chance to follow your reasoning, to duplicate your experiments and see if they get the same result #CarlSagan

There is no more reason to conclude that Mars is lifeless than there is to conclude that it is inhabited #CarlSagan

I think the proper attitude is to keep an open mind and see what the observations uncover #CarlSagan

The universe is not required to be in perfect harmony with human ambition #CarlSagan

In science there are no authorities; at most, there are experts #CarlSagan

To abandon the method of #science, with its skeptical protocols, is the pathway to a dark age #CarlSagan

If we can never acquire information from outside our Universe, is not the idea incapable of disproof? #CarlSagan

Carl Sagan was born in Brooklyn, New York, U.S.A., on the 9th November 1934. From his childhood he has been a very intelligent student. After having education in few schools in the city he was born, he

Skeptical scrutiny is the means, in both science & religion, by which deep thoughts can be winnowed from deep nonsense #CarlSagan

Encourage substantive debate on the evidence by knowledgeable proponents of all points of view #CarlSagan

Einstein says he Believes in the God of Spinoza .... Who or what is the God of Spinoza ?

Ann Druyan, husband of the late Carl Sagan and co-writer of the 'Cosmos' TV Series and films such as 'Contact', was recently asked: "What would Carl Sagan think about the current state of the world?"

Try not to get overly attached to a hypothesis just because it's yours #CarlSagan

A "lost" 1994 lecture by Carl Sagan has been found and published last week on November 9th (the 84th anniversary of his birth). In it, Sagan goes through many of his highlights, which include