Who are we, if not measured by our impact on others?

It is the tension between creativity and skepticism that has produced the stunning and unexpected findings of science.

She had studied the universe all her life, but had overlooked its clearest message: For small creatures such as we the vastness is bearable only through love.

A still more glorious dawn awaits / not a sunrise, but a galaxy-rise / a morning filled with 400 billion suns / the rising of the milky way

Since, in the long run, every planetary society will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring — not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.

There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.

Preserve and cherish the pale blue dot, the only home we've ever known.