Planetary History Quotes

We don't know that Venus had oceans, but there's every reason to believe it did.

This is what the Mars Science Laboratory (MSL) represents. Experimental, explorational science. Learning about Mars as a new world. Discovering new things that will tell us about the history of our solar system, help reveal the secrets of life, and continue blazing the trail that may someday be traveled by the rest of us.

Pluto is still active four and a half billion years into its history. It was expected that small planets like Pluto would cool off long ago and not still be showing geological activity. Pluto is, in fact, showing numerous examples of geological activity on a massive scale across the planet.

Hasn't there always been a moon?" "Bless you. Not in the slightest. I remember the day the moon came. We looked up in the sky - it was all dirty brown and sooty gray here then, not green and blue.

With the collision of the Shoemaker comet into Jupiter, the era of uniformitarian orthodoxy must come to an end. Minds that have been closed for nearly half a millennium can now be opened to see what really has happened to our planet in the past -- and that past is not as distant as we might suppose.

The Huygens images were everything our images from orbit were not. Instead of hazy, sinuous features that we could only guess were streams and drainage channels, here was incontrovertible evidence that at some point in Titan's history - and perhaps even now - there were flowing liquid hydrocarbons on the surface.

It is this subtle dimension of understanding that marks the southwestern Indian peoples from other religions and separates tribal peoples from the world's religions. Somewhere in the planetary history religious expression changed from participation in the sound, color and rhythm of nature to the abstractions of man outside this context pleading for temporary respite and hoping in the next life to return to the Garden.

All indications are that three and a half billion years ago, Mars looked like Earth. It had lakes. It had rivers. It had river deltas. It had snow-capped peaks and puffy clouds and blue sky. Three and a half billion years ago, it was a happening place. The same time on Earth, that's when life started. So did life start on Mars?

On the earth, satellite of a star speeding through space, living things had arisen under the influence of conditions which were part of the planet's history; and as there had been a beginning of life upon it, so, under the influence of other conditions, there would be an end: man, no more significant than other forms of life, had come not as the climax of creation but as a physical reaction to the environment.

What the fossil record does do is to force us to contemplate our place on the planet. We are but one species of several hominids that inhabited Planet Earth, and like our distant cousins who went extinct fairly recently, our time on Planet Earth is also finite.