Spacecraft carry Earth’s goodwill

Spacecraft carry Earth’s goodwill

The Pioneer Plaque attached to the spacecraft before launch • NASA (Public Domain)

Originally published 30 April 2002

Remem­ber 1972? Led Zep­pelin. Car­ly Simon. The God­fa­ther. Hawaii Five‑O. George Wal­lace shot. Water­gate. Bomb­ing raids on North Vietnam.

Mur­ders at the Sum­mer Olympics. Mark Spitz. Pio­neer 10.

Pio­neer 10?

The lit­tle space­craft with the big anten­na blast­ed off March 2, 1972, on top of an Atlas-Cen­taur rock­et. Pio­neer 10 was going to be the first human arti­fact to leave the solar system.

The news media was atwit­ter because of the plaque affixed to the side of the craft, which Carl Sagan helped design, meant as an Earth­ly greet­ing to what­ev­er alien civ­i­liza­tion the space­craft might some­day encounter.

There were protests, as I recall, because the plaque depict­ed a nude human male and female (“Dirty pic­tures,” said let­ters to edi­tors). But most objec­tions were not to the nudi­ty — after all, this was at the height of the Sex­u­al Rev­o­lu­tion — but because some peo­ple thought the images were polit­i­cal­ly incorrect.

It was the male who raised his hand in greet­ing, not the female (male chau­vin­ism!). The male’s gen­i­tals were shown, but not the female’s (sex­ism!). And the fig­ures — delib­er­ate­ly designed to be mul­tira­cial — were thought by some to be too Cau­casian, by oth­ers too Negroid (racism!).

Those were high­ly charged times, and today the con­tro­ver­sies seem rather quaint. After all, the chance that an intel­li­gent alien civ­i­liza­tion will ever see the plaque is exceed­ing­ly slim. Pio­neer 10 is head­ing in the direc­tion of the con­stel­la­tion Tau­rus, but won’t pass the near­est star there for 2 mil­lion years.

In fact, the space­craft is not yet in true inter­stel­lar space. It passed the orbit of Plu­to in 1983, and thus left the solar sys­tem by some accounts, but it still lies with­in the influ­ence of the Sun’s mag­net­ic field and out­ward flow of solar par­ti­cles. Some­time in the next few years, it will leave even that gen­tle touch of the Sun behind.

Thir­ty years into its voy­age, Pio­neer 10 is more than 7 bil­lion miles away, and still in radio con­tact with Earth. Sci­en­tists last con­tact­ed the craft on March 2 of this year [2002], beam­ing a sig­nal to the space­ship’s receiv­er and get­ting a response. The round-trip com­mu­ni­ca­tion took 22 hours, trav­el­ing at the speed of light. By com­par­i­son, a radio sig­nal takes just 8 min­utes to trav­el from the Earth to the sun.

Of the craft’s 11 sci­en­tif­ic instru­ments, only one, a Geiger Tube Tele­scope, is still working.

Pio­neer 10 is nuclear pow­ered, so there’s no prob­lem of bat­ter­ies run­ning out, but it’s some­thing of a mir­a­cle that the space­craft has not yet cut its elec­tron­ic umbil­i­cal cord to Earth. Its sis­ter ship, Pio­neer 11, launched in 1973 and hot on the tail of Pio­neer 10, has been out of touch since 1995.

I love think­ing of that chunk of human engi­neer­ing drift­ing in deep space, head­ing for the stars, nev­er to return, its radio squeak­ing a bare­ly detectable home­sick cry, those lit­tle naked fig­ures affixed to its side fac­ing the unfath­omable gulf between the stars, the male’s hand raised in hope­ful greeting.

The craft was launched in tur­bu­lent times, won­der­ful and terrible.

But most of all those times were hope­ful. The peace move­ment was in full swing, with its dream of glob­al har­mo­ny. Ecol­o­gy and green politics.

Wom­en’s lib­er­a­tion. Civ­il rights. The Peace Corps. Lib­er­a­tion the­ol­o­gy. Flower power.

For all of the chaos that swirled about us, there was a dream that things could be bet­ter, that all humans could live in peace and equal­i­ty, irre­spec­tive of gen­der, race, cul­ture, or reli­gion. The young, espe­cial­ly, were con­vinced that the dawn­ing of the Age of Aquar­ius meant an end to ancient ani­mosi­ties and injustices.

They were wrong, of course. Greed, hatred, and intol­er­ance are still with us. Per­haps they will always be with us. Per­haps they are embed­ded in our genes.

But the dream lives on, and thank­ful­ly so. We know we are not pris­on­ers of our genes, and that we can rise above our baser instincts if only we can ral­ly our­selves to try. We hold to the hope that on this tiny plan­et of a yel­low star in a typ­i­cal cor­ner of the Milky Way Galaxy, we might yet cre­ate an oasis of crea­ture­ly order that is a mod­el for the universe.

Pio­neer 10 car­ries that hope into inter­stel­lar space. With Pio­neer 11 and Voy­agers I and II, which also car­ry mes­sages, it is an emis­sary of our best natures. The Voy­agers bear musi­cal selec­tions from dif­fer­ent cul­tures and eras, and spo­ken greet­ings from humans in 55 lan­guages. That mag­na­nim­i­ty of spir­it was typ­i­cal of the era in which the space­craft were launched. Let us hope we can become wor­thy of the self-image we sent to the stars.


The last suc­cess­ful radio con­tact with Pio­neer 10 occurred in 2003. It is now esti­mat­ed the space­craft is over 11 bil­lion miles from Earth. ‑Ed.

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