"The mass of an object is one of the most fundamental properties of the object. As such, reliable ways to measure mass…"

"All objects are in orbit around the center of our Galaxy. To see how this allows us to infer the mass of our Galaxy, …"

"...the mass where we can see stars is only 1/3 of the mass of the entire Galaxy. This suggests that a lot of mass in …"

"Any man that can hitch the length and breadth of the Galaxy, rough it, slum it, struggle against terrible odds, win t…"

"It's a tough galaxy. If you want to survive, you've gotta know...where your towel is."

"You said it yourself, bitch: We're the Guardians of the Galaxy."

"A long time ago in a galaxy far, far away... It is a period of civil war. Rebel spaceships, striking from a hidden ba…"

"I think that the event which, more than anything else, led me to the search for ways of making more powerful radio te…"

"For as long as there been humans we have searched for our place in the cosmos. Where are we? Who are we? We find that…"

"Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred bi…"