The history of astronomy is a history of receding horizons.

Observation always involves theory.

In nature nothing exists alone.

-- Rachel Carson

The more clearly we can focus our attention on the wonders and realities of the universe about us, the less taste we shall have for destruction.

-- Rachel Carson

There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved.

-- Charles Darwin

The duty of the man who investigates the writings of scientists, if learning the truth is his goal, is to make himself an enemy of all that he reads.

-- Ibn al-Haytham

It's easier to ask forgiveness than it is to get permission.

-- Grace Hopper

The most dangerous phrase in the language is: 'We've always done it this way.'

-- Grace Hopper