To achieve this density of a neutron star at home, just cram a herd of 50 million elephants into the volume of a thimble.

I try to keep this in mind when tied in to a rope 75 feet up in a tree... The history of ideas about our place in the universe has been a long series of let-downs for those who like to believe we are special.

The methods and tools of science perennially breach barriers, granting me confidence that our epic march of insight into the operations of nature will continue without end.

I try to show the public that chemistry, biology, physics, astrophysics is life. It is not some separate subject that you have to be pulled into a corner to be taught about.

The value of the space program is beyond science, it's beyond military; it's a cultural shift in how we think of our place in the universe.

Today, in this, the 21st century, bedtime doesn't matter at all. All that matters is what you set for your DVR.

If you're a scientist, and you have to have an answer, even in the absence of data, you're not going to be a good scientist.