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Earth

Earth

July 27, 2010

in Life,Science

This is one of my favorite passages from Carl Sagan’s book, Pale Blue Dot — the sequel to Cosmos:

We were hunters and foragers.

The frontier was everywhere.

We were bounded only by the Earth, and the ocean, and the sky. The open road still softly calls.

Our little terraquious globe as the madhouse of those hundred thousand millions of worlds.

We, who cannot even put our own planetary home in order, riven with rivalries and hatreds; Are we to venture out into space?

By the time we’re ready to settle even the nearest of other planetary systems, we will have changed. The simple passage of so many generations will have changed us. Necessity will have changed us. We’re… an adaptable species.

It will not be we who reach Alpha Centauri and the other nearby stars. It will be a species very like us, but with more of our strengths, and fewer of our weaknesses. More confident, farseeing, capable, and prudent. For all our failings, despite our limitations and fallibilities, we humans are capable of greatness.

What new wonders, undreamed of in our time, will we have wrought in another generation? And another? How far will our nomadic species have wandered by the end of the next century? And the next millennium? Our remote descendants, safely arrayed on many worlds through the solar system and beyond, will be unified by their common heritage, by their regard for their home planet, and by the knowledge that whatever other life there may be, the only humans in all the universe come from Earth.

They will gaze up, and strain to find the blue dot in their skies. They will marvel at how vulnerable the repository of raw potential once was. How perilous, our infancy. How humble, our beginnings. How many rivers we had to cross before we found our way.

Video by Michael Marantz

In this picture (click for full size), the Sun, which is 109 times larger than the Earth, represents only a single pixel. Think about that for a second. Now consider that the largest star shown, YV Canis Majoris, isn’t even the largest we know of; that title belongs to R136a1, a massive star that shines 10 million times brighter than the Sun and has a surface temperature of roughly 40,000 degrees celsius. Incomprehensible.

I wonder what these celestial monstrosities would be to those of our ancestors who thought a god of our little pixel.

Good Earth Day

April 22, 2010

in Science

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

Image taken by NASA, entitled The Blue Marble.

No one quite knew how to put things in perspective like Carl Sagan:

From this distant vantage point, the Earth might not seem of any particular interest. But for us, it’s different. Consider again that dot. That’s here, that’s home, that’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every “superstar,” every “supreme leader,” every saint and sinner in the history of our species lived there – on a mote of dust suspended in a sunbeam.

The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds.

Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.

The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.

It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we’ve ever known.

– Carl Sagan (1934-1996)

Carl Sagan delivered this speech in a commencement address on May 11th, 1996, commenting on the Pale Blue Dot photograph.

I would have enjoyed knowing him.

For most of human history we have searched for our place in the cosmos. Who are we? What are we? We find that we inhabit an insignificant planet of a hum-drum star lost in a galaxy tucked away in some forgotten corner of a universe in which there are far more galaxies than people. We make our world significant by the courage of our questions, and by the depth of our answers.

Just a Reminder

February 28, 2010

in Science

An image of Earth as seen from Mars, taken by NASA’s Spirit Rover. Found via reddit.

The Blue Marble

February 24, 2010

in Science

NASA has captured the most detailed images of Earth to date; it’s beautiful:

This spectacular “blue marble” image is the most detailed true-color image of the entire Earth to date. Using a collection of satellite-based observations, scientists and visualizers stitched together months of observations of the land surface, oceans, sea ice, and clouds into a seamless, true-color mosaic of every square kilometer (.386 square mile) of our planet. These images are freely available to educators, scientists, museums, and the public. This record includes preview images and links to full resolution versions up to 21,600 pixels across.
Much of the information contained in this image came from a single remote-sensing device-NASA’s Moderate Resolution Imaging Spectroradiometer, or MODIS.

Source and higher quality images available at NASA.gov: Visible Earth: The Blue Marble